5G not working anymore? - Xiaomi Poco F2 Pro (Redmi K30 Pro) Questions & Ans

Hi when I first got my phone 5g under China mobile works fine. But after an update a few months ago only lte works. I disabled the other sim the whole time of course. Please let me know if you know how to solve it.

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Lumia 1020 (RM-875) no calls on LTE

Hello all, hopefully somebody can help me with this, since it's making me crazy.
I have one 920 and recently got a new 1020 from Movistar (Telefonica), RM-875 with 64GB if storage. Everything was great until they launched their LTE network, and when I got a new sim card, I found out the ROM the phone has, comes with 4g-LTE disabled. Off course I did what anyone would do in this situation: I flash my phone with another ROM and I got my LTE working.
After a couple of days I noted that I was only getting SMSs telling me that somebody called me. Then I tried to call myself from another number and it went straight to voicemail. When I changed it to 3G again, calls worked fine. I know LTE doesn't support voice, so the phone should get a "notification" from the network to change to 3g to get the call, but my phone is not reacting to it. I tried the same SIM with the 920 and this one works as expected, when on LTE it changes to 3G to get the call.
I've spent the last two weeks downloading new ROMs to see if any of those can help me, with no luck at all. My last resort is to flash back to the original ROM and bring it back to the shop to see if they can help me. Oh and it's not hardware problem since a friend of mine with the same provider and the same phone, he is facing the same issue.
ANYTHING you can tell me to fix this, will be greatly appreciated, since is like a disappointing to not being able to be on LTE with my 1020.
Thank you!

AT&T on Unlocked Note 8 WIFI Calling why one phone will work and one wont!?

I have 2 Note 8s right from Samsung Unlocked. My dad and I are both on AT&T. We both flashed the AT&T firmware. His works with WiFi calling mine doesn't. The only 2 differences are I took an update the day before we flashed and he did not. Also he has had WiFi calling on AT&T with an LG G6 phone and used it. I have never activated any device on WiFI calling with AT&T prior to this. Last night I put my sim in his old LG G6 and called AT&T to swap IMEI numbers. With that phone I was able to activate WIFI calling.
So is the issue really the unlocked note 8s IMEI numbers not set up with AT&T correctly and my dad got lucky or is it with the firmware software?
I have had so much help from BlueFox721 and a few others I know there is an answer out here.
The crappy thing about this is that it is more important for my dad to have WiFi calling than me but now that I know it is not working I don't want to give up!
chrisusa96 said:
I have 2 Note 8s right from Samsung Unlocked. My dad and I are both on AT&T. We both flashed the AT&T firmware. His works with WiFi calling mine doesn't. The only 2 differences are I took an update the day before we flashed and he did not. Also he has had WiFi calling on AT&T with an LG G6 phone and used it. I have never activated any device on WiFI calling with AT&T prior to this. Last night I put my sim in his old LG G6 and called AT&T to swap IMEI numbers. With that phone I was able to activate WIFI calling.
So is the issue really the unlocked note 8s IMEI numbers not set up with AT&T correctly and my dad got lucky or is it with the firmware software?
I have had so much help from BlueFox721 and a few others I know there is an answer out here.
The crappy thing about this is that it is more important for my dad to have WiFi calling than me but now that I know it is not working I don't want to give up!
Click to expand...
Click to collapse
I hope someone gets it figured out...It would be nice if everything just worked out of the box...
My phone is back to the state it was in out of box I believe. It is telling me Shave an update. I am not sure if the first time it updated it changed something that flashing back to original will not undo. I am contemplating trying to flash the same ATT firmware that I did on my dads or just wait and see what develops over the next few days. I have flashed so many times in the last 24 hours I am not sure what is in my phone

S9+ Exynos on T-Mobile US Journey.

Just received my S9+ 256GB Korean Variant SM-G965N. This is going to be my experience with this particular variant and its compatibility with the T-Mobile network. Currently it shows I'm connected to Band 2 LTE but the speeds I'm my area are very slow. Withing the next couple days I'm am going to test the network throughout my area in Cali and test speeds and connectivity and report back. Unfortunately the build of Samsung pay is customized for S.korea only and not compatible here in the US.
Current build after first update is G965NKOU1ARC7
Baseband versions G965NKOU1ARC4
I have some data speeds this afternoon while out driving. The long screenshot is from my G965 and the short list of from a T-Mobile variant S7 . Connection to the network itself has been stable with no notice of dead spots or issues switching towers, if anything I'd say the switch is faster from what I've notice between devices.
Excellent...a lot of us have been waiting for this...thanks for testing...
I was curious about this. I have a G965U1(S9+ Unlocked North America variant).
I have a second phone with Ting GSM(T-Mobile), and I tried a few speed test. The phone configured it self to send calls over wifi when ever I connect to wifi. I found that peering with Sprint appears to be an issue.
Test 1:
http://www.speedtest.net/my-result/a/3760631925
Test 2:
http://www.speedtest.net/my-result/a/3760634735
Test 3:
http://www.speedtest.net/my-result/a/3760638116
These are all from the same location.
https://imgur.com/a/mYrqj
clockedtouch said:
Just received my S9+ 256GB Korean Variant SM-G965N. This is going to be my experience with this particular variant and its compatibility with the T-Mobile network. Currently it shows I'm connected to Band 2 LTE but the speeds I'm my area are very slow. Withing the next couple days I'm am going to test the network throughout my area in Cali and test speeds and connectivity and report back. Unfortunately the build of Samsung pay is customized for S.korea only and not compatible here in the US.
Current build after first update is G965NKOU1ARC7
Baseband versions G965NKOU1ARC4
Click to expand...
Click to collapse
Yo im one jealous F*** right now.... Lucky effen you, where did you order from?
Also, Samsung Pay is still force closing on most Oreo Builds, have been,....
Hey guys,
I also got an international S9+ (SM-G965F) but from Germany Unlocked (DBT). So far the signal seems to be great. Will post some Speedtests later. The only downside is that wifi calling and VoLTE is not there. It was working with my German sim. Other than that it's been great.
clockedtouch said:
Just received my S9+ 256GB Korean Variant SM-G965N. This is going to be my experience with this particular variant and its compatibility with the T-Mobile network. Currently it shows I'm connected to Band 2 LTE but the speeds I'm my area are very slow. Withing the next couple days I'm am going to test the network throughout my area in Cali and test speeds and connectivity and report back. Unfortunately the build of Samsung pay is customized for S.korea only and not compatible here in the US.
Current build after first update is G965NKOU1ARC7
Baseband versions G965NKOU1ARC4
Click to expand...
Click to collapse
Have you flashed T-Mobile CSC? I assume you have to root and make a custom zip to flash the files. If the phone thinks it's a legitimate T-Mobile phone then it give you full speeds.
Also is the Korean phone a duos? Dual SIM?
Psyscope said:
Have you flashed T-Mobile CSC? I assume you have to root and make a custom zip to flash the files. If the phone thinks it's a legitimate T-Mobile phone then it give you full speeds.
Also is the Korean phone a duos? Dual SIM?
Click to expand...
Click to collapse
I dont think that is possible. Isn't the Korean version run on Exynos? Flashing a Snapdragon CSC for TMB would be wonderful but I think would mess lots of thinks up. Hopefully someone will be able to change the CSC to work on the exynos processor.
Okay so the weirdest thing happened to me. I tried to use Samsung pay a few days ago. I used app cloner to copy the working version of my note 8 snapdragon and sent it to my S9+. It didn't work and gave me the connection error. Now I was just on the phone and out of boredom I tried to open Samsung pay again while on the phone and it magically worked. It asked me for my Iris and fingerprint and I was able to add my cards again. Again, this is on exynos DBT from Germany without any modifications or OEM unlock.
Hope this will help at least with Samsung pay.
Psyscope said:
Have you flashed T-Mobile CSC? I assume you have to root and make a custom zip to flash the files. If the phone thinks it's a legitimate T-Mobile phone then it give you full speeds.
Also is the Korean phone a duos? Dual SIM?
Click to expand...
Click to collapse
Yes am looking into seeing how I can configure the CSC to achieve full T-Mobile speeds. The Korean variant in not a duos.
AndroidDevices said:
Yo im one jealous F*** right now.... Lucky effen you, where did you order from?
Also, Samsung Pay is still force closing on most Oreo Builds, have been,....
Click to expand...
Click to collapse
I have a friend that works at Sammy S. Korea that picked it up for me, as for Samsung pay the apk is specifically built for the Korean market and has a different activation process which requires a text from one of the local carrier networks which I cant bypass.
Sunnyschlecht said:
Okay so the weirdest thing happened to me. I tried to use Samsung pay a few days ago. I used app cloner to copy the working version of my note 8 snapdragon and sent it to my S9+. It didn't work and gave me the connection error. Now I was just on the phone and out of boredom I tried to open Samsung pay again while on the phone and it magically worked. It asked me for my Iris and fingerprint and I was able to add my cards again. Again, this is on exynos DBT from Germany without any modifications or OEM unlock.
Hope this will help at least with Samsung pay.
Click to expand...
Click to collapse
The build is completely different and won't work because of the region and coding in this software build. I am not ready to root yet so I'm going to tinker with software that's official and see what I can get working, improve on for now.
Sunnyschlecht said:
Hey guys,
I also got an international S9+ (SM-G965F) but from Germany Unlocked (DBT). So far the signal seems to be great. Will post some Speedtests later. The only downside is that wifi calling and VoLTE is not there. It was working with my German sim. Other than that it's been great.
Click to expand...
Click to collapse
What operator do you use, I am at T-Mobile with a 695F and it does not connect at 4G.
Anyone has a clue?
titoh said:
What operator do you use, I am at T-Mobile with a 695F and it does not connect at 4G.
Anyone has a clue?
Click to expand...
Click to collapse
Not really. I'm also on T-Mobile USA and have the German exynos. The apn settings were loaded correctly. Maybe check them in the settings and make sure it's set correctly. The only thing that is not working is VoLTE and wifi calling.
Samsung pay finally works with the credit cards but the membership doesn't work.
Gesendet von meinem SM-G965F mit Tapatalk
titoh said:
What operator do you use, I am at T-Mobile with a 695F and it does not connect at 4G.
Anyone has a clue?
Click to expand...
Click to collapse
ow did you do the initial setup with or without the T-Mobile sim inserted ? I noticed when I originally set my Korean variant up without the sim, for some reason I did not connect to LTE in my area and after oem unlock and restart/ full wipe it connected perfectly since.
I've got the same model, I'm with ATT, speed test shows 31m down and 10m up, but actual downland from play store is less than 2m...
Hi do you receive benefits in your samsung members app?
Yes if we can get T-Mobile CSC settings to enable VoLTE and Wifi calling then I will root.
I am recently realizing Samsung Pay is not everything it's cracked up to be. It doesn't seem like they have many 3rd party companies registered, so I made a custom loyalty with the barcode, but it doesn't work when it's scanned at checkout. Funnily enough, I have the loyalty in GPay as well, and it works just fine. Also SPay doesn't seem to work in gas station cc readers where you stick the card in and pull it out instead of swipe. Unfortunately it just doesn't seem like the technology is there yet where we can ditch traditional cards.
snooyy said:
I've got the same model, I'm with ATT, speed test shows 31m down and 10m up, but actual downland from play store is less than 2m...
Click to expand...
Click to collapse
ill trade u lol
@clockedtouch, a few months later now, are you still on the 965F & TMo US? Any update wrt VoLTE?
EDIT: nm, thanks to @TEKHD N8/S8x/S9x OREO USA T-Mobile EFS-CSC DETONATOR v2.2 INT TEKHD

VoLTE working on AT&T need someone to test theory.

Bear with me as I'm no expert and I need to explain what happened.
I have an op6 running Android 9.0.2 rooted with magisk only. Tried all the tricks, installed magisk voenabler, did the numeric codes to condition the phone (*#800# and *#*#4636#*#*) but never got volte to work with att in us. Last week going on a cruise I was having issues with my phone not opening the login page for the ship's wifi (this is another bug on Android 9 because before update I didn't have this issue) so I decided to install the magisk Google dns repo to see if it will fix the issue and it did (the login page). And my volte it's working ever since too. It's being half a day since I'm back and I have rebooted the phone and run speed tests and is working fine. Can anybody with att confirm this to know if this could be a fix or a fluke?
Tried the module, unfortunately it disabled the 2nd sim which is my AT&T one
I'll be able to test VoLTE on At&T via red pocket and see if the MVNO has it later in the month, but I can confirm that when I was using the OP6 on verizon VoLTE was fully working. I was also on 9.0.2 PIE and I didn't need to do anything special to get it to work.
My understanding is your account needs to have VOLTE on it, or else it does not work.
https://www.reddit.com/r/oneplus/comments/9khnbj/enable_volte_on_att_with_op6/
https://forum.xda-developers.com/oneplus-6/help/op6-att-volte-hd-calling-t3794878
I've had VoLTE on AT&T enabled since the beginning. It's an option in xXx's ROM and works great.
Just because the rom has options for volte doesn't mean it will work for everyone. You carrier itself needs to support volte as well. And lots of carrier make you pay extra for it.
se7ensde said:
Just because the rom has options for volte doesn't mean it will work for everyone. You carrier itself needs to support volte as well. And lots of carrier make you pay extra for it.
Click to expand...
Click to collapse
Well, this thread is talking about AT&T, which supports it, and I have been using VoLTE and not paying extra for it. So what's your point again?
Superguy said:
Well, this thread is talking about AT&T, which supports it, and I have been using VoLTE and not paying extra for it. So what's your point again?
Click to expand...
Click to collapse
Actually it's about him wondering if it works you should read the op first and like I said just cause it's supported doesn't mean you automatically get it your not paying extra will that's good for you but there are others that do I actually answered his questions with useful information. What exactly are you doing here other than trying to pick arguments with people.
I'm also on att, not sure what you did wrong there, but i used the voenabler module and it works, have you tried switching your sims and see?
Is it contract or prepaid? I heard people say that prepaid sim won't get volte.
Not working
k0rvan said:
Bear with me as I'm no expert and I need to explain what happened.
I have an op6 running Android 9.0.2 rooted with magisk only. Tried all the tricks, installed magisk voenabler, did the numeric codes to condition the phone (*#800# and *#*#4636#*#*) but never got volte to work with att in us. Last week going on a cruise I was having issues with my phone not opening the login page for the ship's wifi (this is another bug on Android 9 because before update I didn't have this issue) so I decided to install the magisk Google dns repo to see if it will fix the issue and it did (the login page). And my volte it's working ever since too. It's being half a day since I'm back and I have rebooted the phone and run speed tests and is working fine. Can anybody with att confirm this to know if this could be a fix or a fluke?
Click to expand...
Click to collapse
Did everything you said, couldn't get it to work with my OnePlus 3T on Nougat OOS or my OnePlus 6T running Pie OOS. Maybe on a Pixel/AOSP ROM? I called ATT and they said something about my IMEI wasn't letting them enable VoLTE...
TylerHarrison21 said:
Did everything you said, couldn't get it to work with my OnePlus 3T on Nougat OOS or my OnePlus 6T running Pie OOS. Maybe on a Pixel/AOSP ROM? I called ATT and they said something about my IMEI wasn't letting them enable VoLTE...
Click to expand...
Click to collapse
Thanks for your input Tyler, in other words we can confirm that it's att issues because the only thing different that I did from you was using my phone during our stop in Puerto Rico (for those who doesn't know PR is considered us soil so we we can use our phones with no extra charge, it's like calling to another state). I thought I would loose it as soon as I would arrive State side but I still have the service. So something got updated in att when I turned on my phone and used the network from PR that enabled it.
k0rvan said:
Thanks for your input Tyler, in other words we can confirm that it's att issues because the only thing different that I did from you was using my phone during our stop in Puerto Rico (for those who doesn't know PR is considered us soil so we we can use our phones with no extra charge, it's like calling to another state). I thought I would loose it as soon as I would arrive State side but I still have the service. So something got updated in att when I turned on my phone and used the network from PR that enabled it.
Click to expand...
Click to collapse
I have since upgraded to the 6T and am having the same issue

Need urgent help, can't connect the T-mobile Network

I can't connect the T-mobile network by Mi10 Ultra. This is the first time I brought thIs Phone to US. There's no signal at all when I put the SIM card into my Phone. Did anyone solve this issue before? I've actived the VoLTE and VoWIFI button in this ROM, which's the native Chinese MIUI ROM 12.5. Appreciate any expert in this forum is able to help me on this. I saw some people said in this forum they're able to connect T-mobile with no problem. Aslo attached the phone screen copy for reference.
I am in Boston downtown so Tmobile network should be very good.
Wish I could be of more help but I also have Mi 10 Ultra on stock CN rom and using T-Mobile's network in Western Pennsylvania without issue. I literally turned the phone off, put the sim in, turned on, and received signal.
Thank you @inasense . Did anyone has my experience and did something effectively to fix it?

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