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[Q] Stock Photon Q won't detect 4G

Problem:
I have a stock, locked, non-rooted Photon Q, purchased when it launched on Sprint in August 2012. Sprint rolled out LTE in my area (downtown Boston) in roughly February 2013. Since then, this phone has never succesfully connected to, or even detected, a 4G signal.
Android version: 4.0.4
Observations:
Settings > Wireless & networks > More > 4G Status shows "Network Provider: Unavailable" and "IP Address: 0.0.0.0".
##3282# > LTE shows "Enabled: On".
##3282# > LTE is also supposed to have an option to review LTE logs after the first time the phone successfully connects to a 4G network. No such option is visible.
*#*#4636#*#* > Phone Info, ping test shows "Pass" for "ping Hostname" and "HTTP Client test", but for "Ping IpAddr" it shows "Fail: IP addr not reachable". No idea why.
What I've tried:
Obvious stuff. Update PRL, Update Profile, Update Motorola software. Multiple power on/offs, soft resets, hard resets (most recently today).
Sprint tech support (in-store, web chat, phone). Watched them try all the same obvious stuff I tried. Their best idea was to order a replacement phone, and to tell me to call Motorola.
Motorola tech support (phone). They punted, saying the most advanced option they could offer is the hard reset I've already tried. (Seriously? "Level 2" tech support punts after a hard reset?)
A somewhat similar issue was described here: http://forum.xda-developers.com/showthread.php?t=2230107. However, that poster had at one time been able to connect via 4g; I have not. (Also, he had used mods; I have not.) In any event, the post didn't give a resolution.
Any guidance would be appreciated.

How good of a 3g connection did u have? Maybe its just choosing the better connection. Good 3g vs bad 4g
Sent from my XT897C using Xparent Red Tapatalk 2

i apologize profusely in advance for this question, but since it isn't explicitly mentioned: you do have the device set to CDMA/4G in Settings/More/Mobile Networks/Network Mode? i am also asking because i have mine set to CDMA only, and i have all the exact same settings and readouts that you mentioned. sorry if you do have that set tho..
in any case, did you consider letting them give you a replacement?

yogi2010 said:
i apologize profusely in advance for this question, but since it isn't explicitly mentioned: you do have the device set to CDMA/4G in Settings/More/Mobile Networks/Network Mode? i am also asking because i have mine set to CDMA only, and i have all the exact same settings and readouts that you mentioned. sorry if you do have that set tho..
in any case, did you consider letting them give you a replacement?
Click to expand...
Click to collapse
Fair questions; no need to apologize! Yes, I have Network Mode set to CDMA/4G.
As for replacement, it's funny: in the same breath with which they suggested a replacement, the Sprint store techs opined that they don't actually think a replacement will fix the problem. Supposedly, this problem has come up with other Photon Qs before, and replacement didn't help. (That begs the question, what did help before, and why didn't it help my particular phone? Whatever.) So, figuring I have nothing to lose, I OK'd the replacement, but I'm continuing to work on the problem myself on the assumption that the replacement won't help.

screamline said:
Fair questions; no need to apologize! Yes, I have Network Mode set to CDMA/4G.
As for replacement, it's funny: in the same breath with which they suggested a replacement, the Sprint store techs opined that they don't actually think a replacement will fix the problem. Supposedly, this problem has come up with other Photon Qs before, and replacement didn't help. (That begs the question, what did help before, and why didn't it help my particular phone? Whatever.) So, figuring I have nothing to lose, I OK'd the replacement, but I'm continuing to work on the problem myself on the assumption that the replacement won't help.
Click to expand...
Click to collapse
ah ok, i didn't know some Photon Qs had a problem connecting to LTE. have you scoured the site s4gru.com? i'm not sure it would help, but it is another forum site, and the technical knowledge on that site regarding Sprint LTE is pretty amazing. maybe posting there would be good.
i looked at Boston on the map here, and it definitely looks like you should be picking up LTE!
http://s4gru.com/index.php?/topic/2906-sprint-lte-coverage-maps-via-sensorly/
good luck with the replacement, hopefully that one does work..

What PRL is your phone on??
55012 never connected to 4G on my phone...
55013 either, however 55014 works along with 16013...
Sent from my XT897C using Tapatalk 2

hfase said:
What PRL is your phone on??
55012 never connected to 4G on my phone...
55013 either, however 55014 works along with 16013...
Sent from my XT897C using Tapatalk 2
Click to expand...
Click to collapse
I'm on 55014. Is there a way to change that? I know very little about how PRLs work.

That prl should work fine. I would check your settings under "mobile networks" then and make sure its set to "LTE/CDMA"
Digiblur posted an awesome thread explaining what a prl does over at s4gru if you are interested. Also you may want to check sensorly to be totally sure there is 4G available where you are.
Sent from my XT897C using Tapatalk 2

Sorry if this is a dumb question but have you verified with anyone else that they can connect to LTE? I live near chicago and it was almost 3 weeks after sprint officially said they turned up lte before i saw my phone flip to it for the first time.

Just to close the loop on this: the replacement worked. The new handset both detects and connects to LTE, including in all the places the original handset didn't.
I wish I had more information as to why. The settings all look the same. Maybe this was just a manufacturing QA issue? Bad radio? I suppose I'll never know.
But for anyone else who finds this thread after experiencing the same issue -- don't listen to the Sprint techs if they tell you a replacement won't fix the problem.

Shield LTE on T-Mobile issue.

Just got my Shield LTE today. This is my first tablet ever as well as my first unlocked device ever so I've never really had to mess with APN settings before. Long story short, I can connect and get HSPA+ ok but the speeds suck and no LTE at all. My Galaxy S5 can pick up LTE fine and get around 50Mbps down, but the Shield gets only about 5 down on HSPA+. When I search for network operators, my only choices are T-Mobile (2G/3G) and AT&T (2G/3G/4G). Any ideas as to why it can't find T-Mobile LTE network?

Does your phone work with LTE in the same spot? I got my tablet yesterday and moved the TMO SIM from by iPad to the Shield. Got LTE right away without doing anything with APNs. Depending on where you are, TMO LTE coverage is spotty.

Yes. My Galaxy S5 gets about 3 bars on LTE while sitting right next to my tablet that only has 2 bars on 3G. Just got off the phone with T-Mobile and they said they could see me connect to the LTE network and I did see LTE come up on the Shield for a moment but then it almost immediately dropped back HSPA+. I think its an issue with the tablet itself. I'm on hold with Nvidia now.

I'm still trying to get my Shield LTE activated on T-Mobile for the 200 MB free data for life deal. T-Mobile told me that their system saw the Shield's IMEI as a phone, not a tablet, and to bring it into a store so they can see that it is indeed a tablet.

The APN Settings came down by default for me and appeared correct with what I've searched online, but I'm having the same issue where I'm not getting LTE here in the PHX market, in all the places my phone gets full healthy LTE.
I don't want to complain about my H+ signal, but it's just not cutting the mustard if you will.
You find/hear anything useful here Hoju?

I'm seeing the same issue With LTE/Tmobile alsnly HSPA+

I've been in contact with Nvidia support since last week and they have had me send them numorous diagnostic files and bug reports. From what I can tell, the Shield is using NVIDIA
's Icera i500 modem which can be thoroughly tweaked through software updates. I'm hoping this issue can be resolved with such an update. Nvidia level 2 support told me that I was the first case of this reported, so I urge everyone suffering from this issue to contact support so they can see that the problem is not an isolated incident. I'm hoping to hear back from them today regarding this. I will update the thread when I do.

T-Mobile setup my imei number as an iPad to activate sim and didn't give me the pin, called T-Mobile and got it fixed, the pin turned out to be 1234, once he fixed the imei and changed pin, internet started working well and LTE is working as well. Also logged into T-Mobile.com/connectme I'm not sure if that's required but that's where you can buy more data. Hope that helps someone

Hi there, T-Mobile retail dealer here. I've tried 4 different T-Mobile sim cards (2 $50 simple choice plans, 2 $70 simple choice plans) along with 4 of their MVNO's sim cards (Univision Mobile, Straight Talk, Ultra Mobile, Lyca Mobile) and they all had LTE.
With all of the T-Mobile sim cards, the standard APN that's loaded in (fast.t-mobile.com) works perfectly for me.
For the MVNOs, using their respective APNs allowed for LTE, while using "fast.t-mobile.com" on those services only gave me HSPA+
I'm also located right outside of Philadelphia. Not really a populous area but we have good coverage with T-Mobile around here.
Hope this helped.

I also just added ro.ril.fast.dormancy.rule=0 to my build.prop, result so far is stable connection on h+. Without that it was flipping between 3g and h+ constantly and connection was unstable. ive been streaming music and it did change back to 3g, but not back and fourth like before, ill keep an eye on it.
maybe i spoke to soon, i still see it switching. Ill update after some more testing if this did anything or not for me.

genicles said:
I also just added ro.ril.fast.dormancy.rule=0 to my build.prop, result so far is stable connection on h+. Without that it was flipping between 3g and h+ constantly and connection was unstable. ive been streaming music and it did change back to 3g, but not back and fourth like before, ill keep an eye on it.
maybe i spoke to soon, i still see it switching. Ill update after some more testing if this did anything or not for me.
Click to expand...
Click to collapse
Just out of curiosity have you noticed a difference in the last three days overall?

livinonnoslp said:
Just out of curiosity have you noticed a difference in the last three days overall?
Click to expand...
Click to collapse
Not really, guess it was a placebo effect at first and just happened to stay on h+ for a while. from what i have read over the last few days is that on t-mobile's network it switches to 3g to save battery. I just removed the line i added, streaming music right now and just got a drop out. If someone knows or comes up with a way to force it on h+ I would happy, i could care less about battery savings if i just have this thing on my desk plugged in all day.
I got some time today, going to try staying off of wifi all day and see how it acts, might try a couple things if i can find some other options to test. if i find something ill let ya know.

genicles said:
Not really, guess it was a placebo effect at first and just happened to stay on h+ for a while. from what i have read over the last few days is that on t-mobile's network it switches to 3g to save battery. I just removed the line i added, streaming music right now and just got a drop out. If someone knows or comes up with a way to force it on h+ I would happy, i could care less about battery savings if i just have this thing on my desk plugged in all day.
I got some time today, going to try staying off of wifi all day and see how it acts, might try a couple things if i can find some other options to test. if i find something ill let ya know.
Click to expand...
Click to collapse
Thanks for the response. I ended up exchanging mine with a new one that I just received last night. Right now I'm still testing and hopeful it will shape up, mine would drop from H+ to Edge, I do get LTE from time to time but it's very sparse. So far the replacement is doing well but i'm more and more convinced this is a radio issue as the tablet was really certified on AT&T. I've filed a ticket on my old one with Nvidia, no eta on a fix. Anyone that's seeing this go through nvidia support and file a ticket. Hopefully they can get it fixed in the next OTA.

I, too, only get H+ signal from TMO on my Shield. While it's normally fast, it sometimes drops and goes to E(DGE) or none at all.
EDIT: TMO could find nothing on their end via online chat. I'm going to test the SIM in another LTE device, and see if its a SIM issue. Waiting to hear back from NVIDIA. Really hoping our coming-soon 5.0 update fixes this!
EDIT 2: I just heard back from them that the TMO issue is an open bug "and will be fixed in a future update".

shield vs lte?
Yours at least connects, mine wont even do that I probably go to local branch again tomorrow if things wont change by the morning. I hope it works, but i cant activate the sim. Shield recognizes the card, under connections it says T-mobile but every time i turn off WiFi and try to activate the sim via cellular data, it keep telling me theres no connection yet i have 2 bars of their signal

So this means that I could but the 30 dollar a month plan? 5GB data, 100 minutes and unlimited texts?

Did anyone that was having a problem with LTE ever get it resolved? I just picked up the LTE version of the Shield tablet and have yet to see LTE and my phone is getting it fine. I hope a solution was found.

caseyatbt said:
Did anyone that was having a problem with LTE ever get it resolved? I just picked up the LTE version of the Shield tablet and have yet to see LTE and my phone is getting it fine. I hope a solution was found.
Click to expand...
Click to collapse
Yep, I'd be interested as well. I got that tablet since a few months and have problems with the radio too. I'm running LingeageOS 14.1. The latest few builds didn't even find the sim card anymore. Today I got back to stock rom for testing. Sim card is there, but it loses the radio connection every few seconds.
---------- Post added at 08:59 PM ---------- Previous post was at 08:04 PM ----------
I just tried T-Mobile: works like a charm. It seems like Vodafone is causing the trouble. I've tried two different SIM cards and have the problem with both. Country: Germany.

caseyatbt said:
Did anyone that was having a problem with LTE ever get it resolved? I just picked up the LTE version of the Shield tablet and have yet to see LTE and my phone is getting it fine. I hope a solution was found.
Click to expand...
Click to collapse
What LTE band is your phone connecting to? I'm assuming you are T-Mobile? If you're in a band 12 area you might be out of luch as the North American version supports bands 2, 4, 5, 17, 7.

Motorola Photon Q 4G LTE Sprint Question

Greetings,
I have a the above mentioned phone on the Sprint US network.
A friend of mine on Sprint recently got a letter stating that they will be shutting down their 4G WiMax while they do upgrades and focus on 4G LTE. It is a stupid question, probably, but will this impact my phone's ability to get 4G and/or LTE?
Also, I am running Cyanogen Mod 12.1... I saw before something about builds for ms8960 and then now it seems it is going back to xt879/c. I have been downloading the Cyanogen for xt897, is this the correct one for this phone? Because I also see a download for xt897c, but I do not know the difference... other than CM is at 10 for the C and 12.1 for the xt897.
Every new version I will wipe the phone and do a clean install of CM... I created a custom boot animation and flashed the bootlogo.bin, so I know how to use ADB and a little bit of the shell...
I am also wondering though, about this f2fs file system... I wiped the data and cache and gave every possible partition the f2fs. Then I read something about zcache not working correctly or not using f2fs? I'm a little confused. Can someone clarify this?
Sorry for so many questions but I can't find this info through the searches. Or rather I can't make sense of it either. If there is any other information for me to supply just ask, and I will gladly provide it.
Thanks in advance!

The Q is not capable of WiMax, so you have nothing to worry about.
As for your other questions, they are pretty much all answered in the CM thread.

arrrghhh said:
The Q is not capable of WiMax, so you have nothing to worry about.
As for your other questions, they are pretty much all answered in the CM thread.
Click to expand...
Click to collapse
Thank you sir! That is reassuring that I don't have to get a new phone come November. And that also means their 4G LTE coverage will be improved so I should have faster network speeds eh? And clearer calls? Will this phone be able to make "HD" calls using the LTE?
Sorry for the follow up but maybe I'm just dense as I didn't really ascertain the answers... could you point me to the right thread? I know there's the 12.1 and then the [Q&A]... would this be a better place to ask?
I'm also curious about the Mobile Networks settings. Is there a primer somewhere on this? I want to know what I should select as the preferred network type... I'm in the San Diego market and I want to make use of LTE when it's available but I only ever seem to get 3G... also I have data roaming and all that included so is it possible the you can have the phone elect to use another carrier's LTE if available over Sprint's 3G? Does it matter which option I select in the preferred networks list - i.e. if I pick something with GSM and the phone doesn't do GSM will it ignore my preference and choose what works? I also don't know the difference between the CDMA Subscription RUIM/SIM vs. NV. I have seen the question asked but didn't find the answer.
Thanks again, any help is appreciated, even if it's just a link or something general. I just want to do the best to get the best network experience with this phone.
Thanks!

nasch007 said:
Thank you sir! That is reassuring that I don't have to get a new phone come November. And that also means their 4G LTE coverage will be improved so I should have faster network speeds eh? And clearer calls? Will this phone be able to make "HD" calls using the LTE?
Sorry for the follow up but maybe I'm just dense as I didn't really ascertain the answers... could you point me to the right thread? I know there's the 12.1 and then the [Q&A]... would this be a better place to ask?
I'm also curious about the Mobile Networks settings. Is there a primer somewhere on this? I want to know what I should select as the preferred network type... I'm in the San Diego market and I want to make use of LTE when it's available but I only ever seem to get 3G... also I have data roaming and all that included so is it possible the you can have the phone elect to use another carrier's LTE if available over Sprint's 3G? Does it matter which option I select in the preferred networks list - i.e. if I pick something with GSM and the phone doesn't do GSM will it ignore my preference and choose what works? I also don't know the difference between the CDMA Subscription RUIM/SIM vs. NV. I have seen the question asked but didn't find the answer.
Thanks again, any help is appreciated, even if it's just a link or something general. I just want to do the best to get the best network experience with this phone.
Thanks!
Click to expand...
Click to collapse
I would ensure everything works network-wise on stock before flashing CM. If it doesn't work on stock, get the provisioning etc sorted before going to CM.

arrrghhh said:
I would ensure everything works network-wise on stock before flashing CM. If it doesn't work on stock, get the provisioning etc sorted before going to CM.
Click to expand...
Click to collapse
Thank you and that's good advice my friend, but the horse is waaaaayyy outta the barn on that one. I've been using CM now since 10. Now on to 12 which is going ok. Has its issues but most of the time (when at home or near a reliable LTE signal) things work alright!

Freedom Mobile No LTE On LTE Network

I'm in Toronto. On the Freedom Mobile LTE Network. I'm not getting LTE. Checked in About Phone, in the Hidden Menu, in Mobile Network in Settings, LTE is not working.
I called their tech support, told them this and they lied to me, told me the 4G I'm getting is the LTE.
In About Phone UMTS:3 and HPSA+:15 is 4G according to my research.
When I bought the phone they said LTE would be enabled in a firmware update. Only update so far was camera fixes.
So remains to be seen how long we need to wait to actually get LTE.
Okay, I emailed tech support a few days ago, we're still waiting on a firmware update for LTE here, tech guy says should be before Xmas.

Are you on the new LTE plan?
otherwise it might not work.

Yes, I am, I emailed them, tech guy said we're waiting on a firmware update.

| hello DP,
same boat here.
what is the fmrmware name or version to be applied?
on a side note: have you tried rooting your v20?
Thanks!
---------- Post added at 09:07 PM ---------- Previous post was at 09:05 PM ----------
sigh...
http://pocketnow.com/2016/12/06/canadas-freedom-mobile-discounts-lg-v20

You can see the people in Howard Forums talking about this, their lte network is live but you can't actually connect to it.
By dialing *#546368#*915# and going into the modem settings you can force switch to the LTE band you want, but it won't connect. I assume by "firmware update" all they're really doing is giving permission to the phone, cause the network is already there.
I'm getting 80mbps down, but my phone is unlocked and I'm on another carrier.
Freedom is apparently going to actually turn the network on before the holidays, whatever that means. Don't waste your time because there's nothing wrong with your phones, freedom just lied.

seems like we all need to wait for the V20 firmware update to enable the LTE66

Same here, when I go to Field Test->Modem Settings->LTE Band Selection, I don't see Band 66. So I guess we have to wait for the next update (picked up the phone from WIND today and installed the update it prompted for, says up-to-date now)

The WIND Freedom store rep told me today that LTE/VoWiFi update should be live tomorrow. Hoping they actually deliver as promised

I called wind freedom support yesterday and the agent was clueless.
Asked me to do the standard reboot procedure.... (',,,,, sigh. ,,,,,,,,)

diehard2013 said:
I called wind freedom support yesterday and the agent was clueless.
Asked me to do the standard reboot procedure.... (',,,,, sigh. ,,,,,,,,)
Click to expand...
Click to collapse
he was probably hoping the OTA update will pop up after the reboot.
but OTA doesn't work that way, it depends on the server side, also depends on when the phone did a last check-in with the server.

Just got a text to do an OTA upgrade to enable LTE.
Update was dated Dec 5th, but otherwise it had the same blurb about fixing the camera as the last OTA.

desync0 said:
Just got a text to do an OTA upgrade to enable LTE.
Update was dated Dec 5th, but otherwise it had the same blurb about fixing the camera as the last OTA.
Click to expand...
Click to collapse
same here, usually I would eat the 556mb over data, but at our 3g speeds? that would just be silly
i'll post a speed check later tonight

I'm downloading at home on wifi, I don't think 3g would matter.
50mbps internet and it's only at 50% after 20 minutes lol

Lets just hope root still works after, dont wanna be the guinea pig for our variant lol
Sent from my LG-H915 using Tapatalk

Pfft like we're ever going to get root lol

We have it, already confirmed that the process works, but the user is using it on rogers, so waiting to hear if it works on freedom
Sent from my LG-H915 using Tapatalk

Freedom Mobile Firmware Update -LTE Live, 55 Down, 36 Up!
Worth the wait, pretty incredible to be honest. Got almost 56mb/sec down, over 36 up with Speed Test app.

Just got the phone yesterday, still no notfication to update or anything of the sort

Does it say lte or still 4g? I did the update, but speeds arent really that big of an improvement. 8mb dl and 6mb ul. Am i supposed to do anything else?
Sent from my LG-H915 using Tapatalk

Is the update labelled as an LTE upgrade?

[Global ROM] MMS and Verizon - Called Verizon Support, Still Broken

Hello all,
Phone: Mi Mix 2S
MIUI: Global 9.6.4 Stable
Model: M1803D5XA
Carrier(s): T-Mobile(SIM1) & Verizon(SIM2)
Issue: MMS receiving is limited to 30kb when using the stock Xiaomi and Android Messages messaging apps. APN settings do not show on device for Verizon SIM(doesn't matter if in Slot 1 or Slot 2).
So I called Verizon and worked with level 2 tech support to try and troubleshoot this issue. Basically, the MMS and/or Device server on Verizon's end cannot verify the device and therefore limits MMS sending to the device as it cannot authenticate. This verification is done by verifying the IMEI of the SIM and the device identification.
So basically level 2 tech support cannot verify the device manually and cannot submit a request to add the device information either, it has to come from the vendor(Xiaomi) to Verizon.
Anyway we can request this from Xiaomi going forward? Seems weird to have all the bands for Verizon, can get full 4G LTE coverage but I can't receive more than 30kb per image.

I had this issue at first. Flashed latest stable and it was fixed. It's fixed on miui 10 beta and its fixed on treble builds

aeppacher said:
I had this issue at first. Flashed latest stable and it was fixed. It's fixed on miui 10 beta and its fixed on treble builds
Click to expand...
Click to collapse
Well I flashed to 9.6.4 stable, which I thought was the latest stable?
I'm flashing MIUI 10 right now...guess we'll see what happens.
*Edit, still not working on Verizon. And now on MIUI 10, Dual 4G is broken.
*Edit 2, now I have Dual 4G back. Verizon needs to be SIM 2, but be the default for Internet....

I'm on VZW only and I'm on the latest MIUI 10 beta. I'm experiencing this as well. My wife receives good quality images from my phone but when she sends from her Pixel XL to me they are terrible. As are images I receive from anyone else. Kind of a bummer.

Are you guys having issues getting connected on Verizon now? I'm not able to reliably connect at all, most of the time it just sits on 1xRTT on VOICE, and won't connect to data. I can get it to connect to LTE/VOLTE by smashing airplane mode or disabling radio over and over again. Occasionally it will go to LTE, but it doesn't stay working and drops out. I can't drive anywhere and even conduct a phone call as that doesn't stay up either. When it drops, it hard drops and acts like the modem is being reset, instead of roaming to a new cell tower.
Edit, forgot to mention, called VZW, they gave me the finger and tried to sell me an iPhone XS Max 512GB as a "suitable replacement" for my 8GB/256GB phone. They were not helpful, and told me that they have "teams taking steps to make uncertified phones not work on Verizon's network for security and safety reasons". I have tried two different sim cards as well, both with active service and both work in all 3 generations of Pixel XL that I have.

Why the hell would Verizon troubleshoot a phone they haven't certified for their network? Quit complaining.
Sent from my Mix 2S on VZW & Google Fi

JonMS said:
Why the hell would Verizon troubleshoot a phone they haven't certified for their network? Quit complaining.
Sent from my Mix 2S on VZW & Google Fi
Click to expand...
Click to collapse
Cause I pay them every month to provide me with service. They could've atleast escalated to someone with a brain and ability to look at logging on their side and tried to help. Your comment was not needed.

I have been struggling for days with my Verizon connected Mi Mix 2s. At times I could connect with VOLTE but I lost my MMS. This past weekend I tried various ROMs with no difference. I finally cleared everything, loaded TWRP and then flashed the Global developer beta.
I also put my SIM back into a phone that Verizon would recognize and reset the card.
When I was up and running again I did the *#*#86583#*#* to unlock VOLTE and then the 4636 dial to set LTE only. So far so good. I was then able to go back and add a correct apn for verizon. With Verizon Messaging app everything is working and stable, including MMS. Afraid to mees with it again. But it is possible to get the phone to work with Verizon.

mesament said:
I have been struggling for days with my Verizon connected Mi Mix 2s. At times I could connect with VOLTE but I lost my MMS. This past weekend I tried various ROMs with no difference. I finally cleared everything, loaded TWRP and then flashed the Global developer beta.
I also put my SIM back into a phone that Verizon would recognize and reset the card.
When I was up and running again I did the *#*#86583#*#* to unlock VOLTE and then the 4636 dial to set LTE only. So far so good. I was then able to go back and add a correct apn for verizon. With Verizon Messaging app everything is working and stable, including MMS. Afraid to mees with it again. But it is possible to get the phone to work with Verizon.
Click to expand...
Click to collapse
Hi - is your SIM a newer (or brand new) SIM? I am seeing something in the logging on the radio logs that the SIM doesn't contain any carrier information, and was also seeing several errors about missing CMDA specific settings. This weekend I spent most of the day on Saturday and Sunday testing build.prop edits, and messing with the apns-conf.xml file settings. I could not get anything other than 1xRTT most of the time (I modified one of the existing entries in the list of APNs to be an exact match of what my Pixel 3 XL has) and by forcing LTE Only in *#*#INFO#*#* I was able to get LTE for brief periods of time, but not consistently. On 8.11.29 and 8.11.23 builds I can't get data working consistently, and if VOLTE isn't turned on, I can't get it to even act like it's going to connect LTE. I checked the APNs and played with it for hours, but not much success. The device just seems to "connect" but if you try to call on VOLTE or use LTE data to do something, the radio appears to reset. I am wondering if someone at Xiaomi neutered something in the RIL setup for their builds that broke CDMA compatibility. When I have time again, I will do some more comparison to see if I can figure out why it's not working. I'm planning on decompiling some of the files in question and looking at the code and configurations to see if something in there is the cause. The radio logs do not have a smoking gun. I also grabbed a copy of the build.prop file from MIUI9/Oreo and I am going to compare to see if they have some kind of prop flags that are missing in the MIUI 10 builds and or PIE builds.
I am going to find a way to make this phone work on Verizon.
Eventually, I rolled back to MIUI9 on Oreo (I don't know the build off the top of my head and the phone isn't near me) via fastboot. I have been able to get decent connectivity with that software version on Verizon where I live. I had to create my own APN, and have been using that with limited success. I submitted a bug report on the MIUI bug reports page. If you want to upvote that bug, the link is here: https://en.miui.com/thread-4724630-1-1.html
Edit: I just went to lunch and couldn't get the phone to connect to anything but 1xRTT the whole time we were at lunch (I didn't force LTE only, as I haven't had to previously since I rolled back). My next steps when I have time is to compare the build.prop between the builds, but I am not expecting to find anything. I am starting to suspect from the differences in the way the logging looks that they may have messed with the code or config information for the the RIL setup in the Android before they built it.

Please keep posting what you try, I'll be following with interest! I had everything working for a while but since MIUI 10.0.6.0 mms has broken.

DeadJenkins said:
Please keep posting what you try, I'll be following with interest! I had everything working for a while but since MIUI 10.0.6.0 mms has broken.
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Can you get data and phone services? Mine won't stay connected, but that could be a hardware problem.

PWn3R said:
Can you get data and phone services? Mine won't stay connected, but that could be a hardware problem.
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Yeah, data and phone have been fine so far, I think a few times it's disconnected but messing with the APN has fixed it. In general, I'd say my data and phone have been pretty stable. MMS on the otherhand, I had working for a bit on 9.6. On 10.0.4.0 it's been really slow to send and receive or not working at all. When it did work, picture quality was awful.

PS, I have my phone set to Vietnam by mistake. I have an older SIM card, at least a few years.
PS still working fine.

Mine has been repaired, they had to resolder a connector for the antenna on the board and the logic board was dropped. I saw this happen, however, signal levels are as good if not better than the pixel devices in the same spots for me, so I don't think anything is permanently damaged. I've been debating trying to order another Mi Mix 2 from somewhere or ordering a Mi Mix 3. I have built roms and have a lot of android troubleshooting experience, and I can't seem to figure this one out. What I am seeing on my device is that once it is connected, it seems to not want to roam properly. Like disconnecting from one cell causes a modem reset and then it takes a long time to reconnect. I am going to keep working on it though.

PWn3R said:
Mine has been repaired, they had to resolder a connector for the antenna on the board and the logic board was dropped. I saw this happen, however, signal levels are as good if not better than the pixel devices in the same spots for me, so I don't think anything is permanently damaged. I've been debating trying to order another Mi Mix 2 from somewhere or ordering a Mi Mix 3. I have built roms and have a lot of android troubleshooting experience, and I can't seem to figure this one out. What I am seeing on my device is that once it is connected, it seems to not want to roam properly. Like disconnecting from one cell causes a modem reset and then it takes a long time to reconnect. I am going to keep working on it though.
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So you had a hardware issue? After the fix, which things work and which don't work for you? When I disable VoLTE carrier check, I get the VoLTE symbol, but I can't make any calls. I've been messing with the SMSC, where it seems changes aren't persisting. I can't get mms to work anywhere but the stock app, which sucks because the stupid MIUI stock messaging app doesn't have group mms >.>

I had a screen break due to it falling on a very sharp corner of an object from about 6 inches up. I took it to a phone repair place locally. They dropped the logic board, camera, front facing camera/charging interface board as well from like 4 feet up onto concrete. The person who tried to repair the screen (which I provided the replacement for) did not follow the instructions on the video either and removed the plastic lining bezel from the phone body (you are supposed to remove the screen from the bezel with a heat gun). They had to send the phone out for micro-soldering to re-place and reattach the antenna connectors for the cellular and wifi antennas. They had to pay for that. I know what the phone looks like inside from watching the videos of how to replace the screen. When they gave the phone back, there was a substantial gap between the edge of the screen and the bezel in a couple spots (atleast 3 or 4 sheets of paper thickness). I ordered a new frame, bezel and screen all in one and replaced it myself (moved all the components from the original phone body to the new one). Everything appears to work, signal levels are good, but the cellular part will not stay connected, and the modem acts like it's resetting all the time. Sometimes it will stay connected to the repeater in the office I work in for 8 hours straight with no issues, and I can text and call. When I leave that area or go home, it doesn't seem to want to roam to service, and instead of switching cell sites it seems to just reset the modem. There is absolutely a possibility that some small transistor, resistor, cap or something else on this board got damaged when it fell. Given that you guys aren't reporting issues with your devices staying on the network, I'm starting to think I need to go back and make some serious noise at this repair place. I am no stranger to working on sensitive electronics, and I was extremely careful not to damage anything inside when I moved the components (and it was already exhibiting this behavior when I got it back from them before I took repairs into my own hands).
That said, I've spent the last two days trying to figure out if I can do anything that might be helpful with QPST and QXDM as well as playing with various additional build.prop configuration. Nothing there that seemed to help. Rolling back to MIUI9/Oreo seemed to help some but was not a magic bullet. I still had to manually configure APNs and find myself needing to reboot or airplane mode every time the device should roam to a new cell site. I am planning on trying to copy the "carrierconfig.apk" file that is part of the system settings off of a Pixel 3 XL onto the Android Pie MIUI10 beta to see if possibly Xiaomi has something jacked there, but since you guys aren't reporting issues, I am seriously starting to suspect that something is physically damaged after that drop on the logic board, but the intermittent behavior and the fact that the signal looks correct and normal when it's working is going to make it nearly impossible to identify the cause.
As a side note, there's a Mi Mix 3 on it's way from GearBest....
---------- Post added at 04:00 PM ---------- Previous post was at 03:10 PM ----------
DeadJenkins said:
So you had a hardware issue? After the fix, which things work and which don't work for you? When I disable VoLTE carrier check, I get the VoLTE symbol, but I can't make any calls. I've been messing with the SMSC, where it seems changes aren't persisting. I can't get mms to work anywhere but the stock app, which sucks because the stupid MIUI stock messaging app doesn't have group mms >.>
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So on mine, I can't get it to connect whether VOLTE check is enabled or not. At the office I'm like 10 feet from a repeater, and it seems to connect on LTE/VOLTE (if that's toggled on) very quickly. I have VOLTE enabled on my Verizon account. On the extender, I can make calls on VOLTE, but can't call without VOLTE enabled. I can't get it to connect to VOLTE with the VOLTE carrier check enabled, I have to shut that off and manually toggle. I am noticing massive inconsistencies in the configuration information contained inside the carrierconfig.apk that is loaded in the system build by Xiaomi. I don't see a smoking gun there, but there's a metric crapton of differences.
If I am not next to this Verizon repeater, it usually takes multiple airplane mode cycles or reboots to get onto LTE, it just sits on 1xRTT forever, no texts or data come through when stuck in that mode. Any type of cellular roaming that should happen seems to just cause a radio reset, and it goes to blank bars with X and then it acts like it can't find a network to connect to for a while or goes 1xRTT with full bars and keeps resetting every 20-30 seconds.

PWn3R said:
Cause I pay them every month to provide me with service. They could've atleast escalated to someone with a brain and ability to look at logging on their side and tried to help. Your comment was not needed.
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How is Verizon supposed to support a device they aren't familiar with? This post comes off as whiney. Verizon does NOT have to support every phone capable of their bands, that isn't up to them. Way too many variables using an outside device. With that said, running the latest global beta with the sim card out of my Pixel I have zero issues running Verizon Wireless as primary and Google Fi sim as secondary. Both networks getting VoLTE.

JonMS said:
How is Verizon supposed to support a device they aren't familiar with? This post comes off as whiney. Verizon does NOT have to support every phone capable of their bands, that isn't up to them. Way too many variables using an outside device. With that said, running the latest global beta with the sim card out of my Pixel I have zero issues running Verizon Wireless as primary and Google Fi sim as secondary. Both networks getting VoLTE.
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I expect Verizon to use the standards defined for how these devices communicate. I expect Verizon to assist with troubleshooting by providing information and looking at logs as to what my device is doing on the network. This is not unreasonable. I am not asking them to tell me how to fix the problem on a device they don't support. I am not expecting them to just suddenly support a device, but I do expect them to be willing to look at logs and information on their side and provide feedback. I am glad to hear yours is working and am starting to suspect mine has some kind of hardware damage. The local repair place has refused to do anything to help out because "if it's got a signal, it's a software problem".

PWn3R said:
I expect Verizon to use the standards defined for how these devices communicate. I expect Verizon to assist with troubleshooting by providing information and looking at logs as to what my device is doing on the network. This is not unreasonable. I am not asking them to tell me how to fix the problem on a device they don't support. I am not expecting them to just suddenly support a device, but I do expect them to be willing to look at logs and information on their side and provide feedback. I am glad to hear yours is working and am starting to suspect mine has some kind of hardware damage. The local repair place has refused to do anything to help out because "if it's got a signal, it's a software problem".
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Well, if it worked before the repairs.. it is definitely a hardware issue.

Check your APN settings. I had the exact same issue with my phone, especially after the latest update. I called Verizon for the customer support and they couldn't figure out as well. Then, I pretty much looked at every settings on my phone and tried almost everything, only to have the issue fixed by modifying the APN settings. For some reason, after the update, the SIM card removed the custom APN settings that I added when I first purchased the phone. Instead, it had the CBS, FOTA, IMS, LTE - Verizon Internet APNs available with the APN set as the CBS (Sorry I'm not an expert, so I really don't know what exactly they are. I suspect that those were pre-saved on my SIM cards as I have used the same one for 3-4 different phones?). Anyway, I googled Mi Mix 2s Verizon APN and set it according to the very first result I found. Since then, the MMS has started working well again. Hope it helps.