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[Q] Baseband (modem) questions

After much reading, and stumbling over the same posts repeatedly, I must ask for help.
Heres the phone:
Gt-i9100
2.3.6
i9100NEKF2
2.6.35.7-i9100XWKK5-CL754841 [email protected] #2
Checkrom RevoHD V4
CriskeloROM Gingerbreak v32
Currently have a Optus sim loaded into it, staying in Melbourne Australia.
Optus seems to be lousy, I've talked to several people who seem to agree. Since public perception is far from accurate, I cant really blame optus entirely. I havent tried any other SIM cards yet since I need the optus number at the moment.
I've tried quite a few ROMS and quite a few different Kernels, not being able to tell much of a difference in signal strength. The phone will have the 3g icon lit up, but refuse to do almost any activity. Then five minutes later in the same location it is working perfectly, with a ping of 147ms and download rate of 327.7kB/s (using Speedtest.net)
Since I am using KitchenPro I am able to change the modem easily, some dont work, others do. How do I narrow down which ones are best for the phone? The answer of "use it for a little while and you'll know" cant be the best answer. Is the carrier-shipped modem the best that is available? I've read the modem ref guide and it doesnt offer anything other than a list of letters and numbers. Some people have reported things working well with telstra on particular modems, but nothing on Optus.
1) Is a baseband or modem something that will either work, or not work? Or there a signal difference from one to the next.
2) I almost always have 3+ bars of connectivity for the cell service, it works fine, all the time, even with the modems that did not allow data connectivity the phone always seems to work. Does a modem package effect both cell service and data?
3) What would be the most effective method of testing a new modem?
4) Is there a guide somewhere that lists the guts behind the modem packages, ie frequency ranges, so that I can look up the carrier, and match it manually with a modem?
Please Help! With spotty services available, and no means of telling if my problems are carrier related or phone software issues, I find this quite frustrating.
Thanks for reading

[Q] Signalstrength and mobile internet connection issues

I often have issues with my signal being at 1 or 2 bars where friends of mine (Galaxy S3 and iPhone 4, but same operator) have like 4 or 5 bars. Sometimes people cant even call me even though my phone shows 1 bar of signal.
Buts thats not the worst thing. My mobile internet connection seems to not work EVERYTIME I'm in some kind of tunnel, sometimes even in normal houses. It shows that it tries to get information (arrow up and down) but it doesn't (it even switches from H to 3G, which doesnt even make sense). In the end it tells me the networks not working.
Does anybody have similar issues?

Some boost mobile user reported similar behaviour.

I've flashed the ICS radio and signal is much stronger. While running the jb update I would have full bars and still get 'bad connection please turn on WiFi to connect to the internet' 4g full signal would do the same thing. Until I flashed ICS radio of course.
---------- Post added at 10:05 AM ---------- Previous post was at 09:58 AM ----------
Edit. Probably the network, looks like jb radio is the same one, weird though my signal is much stronger now. Must have been a placebo, + the network being 'optimized'
Edit. Can any one verify the boost mobile jb radio? 'its the number under settings next to baseband'
Mine is 1.12.50.0516

russellvone said:
I've flashed the ICS radio and signal is much stronger. While running the jb update I would have full bars and still get 'bad connection please turn on WiFi to connect to the internet' 4g full signal would do the same thing. Until I flashed ICS radio of course.
---------- Post added at 10:05 AM ---------- Previous post was at 09:58 AM ----------
Edit. Probably the network, looks like jb radio is the same one, weird though my signal is much stronger now. Must have been a placebo, + the network being 'optimized'
Edit. Can any one verify the boost mobile jb radio? 'its the number under settings next to baseband'
Mine is 1.12.50.0516
Click to expand...
Click to collapse
I just got my replacement phone. Let's see if this One SV has the same problems. If so, I'll tell them to give me a different phone, I can't use it like that. I'll tell you guys.

I got a new one. It's a non LTE though. But it works way better now. Driving through tunnels makes my mobile Internet disconnect for a second now, but I guess that's pretty normal. Before it didn't work at all in tunnels. Maybe it had to do something with the LTE variant.
Gotta check if the phone signal got stronger too.
By the way I'm writing this while being in the subway station.
Sent from my HTC One SV using xda app-developers app

My LTE SV has roughly the same reception as my old phone, the Desire, which has always had great reception for me. So in your case it must have been either a defective terminal or maybe some weird software issue.
It's a shame, though, that they've replaced your SV with a non-LTE one. You did pay for the LTE version, that's what they should've replaced it with.

Well, something is still not right with this phone. Even though my mobile internet is working as intended now, I still have big connection issues. Sometimes (at least 5-10 per week) I lose my signal completely, which shouldn't be too much of a problem if it lasted for like 10 seconds or so, but it doesn't reconnect on its own. I have to restart my phone every time. People often can't call me for hours because I don't notice that it lost its signal once again.
I will call them and tell them I want a different phone as I'm still paying for it. I can't use this one anymore or at least not for my job.
Sent from my HTC One SV using xda app-developers app

Well, now that's weird. I mean OK, you might get one bad terminal, but to have it replaced and still have the same issues...?
It might be that your radio/ROM isn't compatible with the network, or maybe you have a bad SIM card. Try and replace the SIM, see what happens.
I live in a bad signal area. I usually get 1-2/5 bars on WCDMA and 3-4/5 GSM bars. Sometimes when the phone switches connections it'll take 2-5 seconds to do so, but i've never had it remain offline etc.
Could you please tell us where you're from/what operator you're subscribed to?

TVTV said:
Well, now that's weird. I mean OK, you might get one bad terminal, but to have it replaced and still have the same issues...?
It might be that your radio/ROM isn't compatible with the network, or maybe you have a bad SIM card. Try and replace the SIM, see what happens.
I live in a bad signal area. I usually get 1-2/5 bars on WCDMA and 3-4/5 GSM bars. Sometimes when the phone switches connections it'll take 2-5 seconds to do so, but i've never had it remain offline etc.
Could you please tell us where you're from/what operator you're subscribed to?
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Click to collapse
I'm from germany and my operator is o2. I contacted them again. They told me they can only send me another replacement phone, which wont change anything for sure.
My problem really isnt that it doesnt have signal for a short time period. My problem is that it stays like that for hours!

Please stop quoting the post you're answering to if said post is right above yours. It clutters up the forum.
Right then. So ask for a LTE replacement - that's what you've paid for, that's what they should give you, and see if the problem persists. If it does, use the phone without an SD card for a few days, try not to install any „toggle” software (like 2g/3g toggle widgets etc.) and replace your SIM card (it should either be free or cost you some 2 EUR - that's what Vodafone charges here in RO). If the problem still persists, it must be a network issue.
If you have a few minutes, try this: Settings -> Mobile Data -> Network Operators -> Search Networks, give the phone a few minutes to look for networks, then when it displays the network list, tap on yours and allow it to register. See if this changes anything.

Sorry sir. I'm just pressing that reply button. Didn't know about the one under it.
I just found out something pretty retarded. I went for the network settings and chose the network mode "GSM/WCDMA" instead of "GSM/WCDMA/LTE" and it instantly jumped to 5 bars from 1. It's the fricking LTE network.
By the way i made a mistake. it was a LTE version replacement from the beginning.

Yupp, thats what i always do: let the phone always work in the best available network (set by me to GSM Only).
This Network is pretty stable at my place and its also battery saving because it don't search/switch for another net.

Well that's quite crappy though. I didn't buy a LTE phone and a contract that allows me to use it, just to find out that it doesnt work as intended.
God I hate it.
I told them that this is the problem and they're just sending me a new sim card. Don't really expect this to help, but let' try out and afterwards I'll just contact them again.
At least the phones stable now...

Well, it's not the phone's fault. It's the operator's fault. Their LTE network is not developed enough. You should be happy, though. Vodafone Romania does advertise LTE, but the coverage is somewhere near 0.01% of the country (mostly near Vodafone shops or by the seaside). So where i live i don't even get LTE. And i live in the capitol. :laugh:

Thats what i think. LTE is far away from stable and everywhere available.
Near to me is a village, where you can't use a mobile phone, because there is NO network at all, lol.

What?! In DE? I thought that only happened in the East!

Yupp, in the middle of "DE"...
Lol, don't wanna live in this village. Many jokes and so, you can imagine

My connection is crazy good. Better than WiFi..... I'm loving it.

russellvone said:
My connection is crazy good. Better than WiFi..... I'm loving it.
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Click to collapse
russellvone, you're lucky.
In the area I'm in a bunch of Boost customers had serious signal strength issues starting last week, and data feels like it's been throttled to 2g/EDGE while we all get "4G" on our status bars.
Service feels like it's been declining, and I've only been with them since June of this year.
PRL updates did nothing.
I used Tmobile prepaid for my personal phone since the Nexus S launched, then a Galaxy Nexus.
The only reason why I didn't get a Nexus 4 was that I thought I was missing out on something without LTE.
I got the SV for free, so I didn't exactly choose Boost.
I just needed something to hold me over a few months.
Now, I won't care if the Nexus 5 has LTE or not, I'm buying one and going back to Tmo.
The SV is fine, the service.....that makes it or breaks it for me.

[Q] Galaxy S3 I535 No Service After KitKat Flash (4.4.4)

Hello everyone. I was hoping that some of you that are more knowledgeable about this stuff could help me out here. I recently flashed from CM 10.2 to KitKat (4.4.4), which everything went smoothly for the most part. However, I've noticed that my phone constantly has no service. I should probably state that I live in an area with very low service to begin with, but prior to the flash I was able to get at least a bar inside my house. Now, I'm unable to get anything.
The first thing I could think of to check was my settings in the phone. The data is enabled, CDMA Roaming mode is set to automatic, CDMA subscription is set to RUIM / SIM, and the Preferred Network Type was Global. I wasn't familiar with the global setting as I was used to seeing the LTE / CDMA / EvDo options there. So, when I clicked on it, it now gives LTE, 3g, 2g, 1x, and Global as options. I tried changing it to 3g, but the changes would not save that way. The only way I could get them to save was to power off the phone, take the sim card out and put it back in, and then reboot and switch them. Once i pick a new setting (which is now set on 3g), it locks it and I can't change it again without removing sim card.
When I look in About Phone > Status section, I'm seeing the network says searching for service. The mobile network type is unknown. The service state is out of service, and the mobile network state is disconnected.
Is there anything I can do to fix this issue? If so, I would truly appreciate any type of guidance you guys or gals could give me. Thanks!

I didn't read your entire post but myself and several others have reported signal issues after 4.4.4 flashes on all different ROM types. I think 4.4.4 is just picky about what firmware and baseband you're running. I flashed a few different RPM packages too but in the end I got lucky flashing the BLK3 modem and it seemed to fix my issues. I had noticeably poor signal strength most of the time and a couple times I would look down at my phone and I'd have no signal at all.
Maybe a dev or expert can shed some light on the root of the issue. I don't know enough about under the hood stuff to make an expert diagnosis.
Edit: The unanimous fix that everyone appears to agree on is to flash the MF1 AIO (all in one) package and then flash the ML1 modem only. Problem is finding a legit source for the MF1 aio package seems to be up in the air.
Like I said though, I didn't even do this. I was just trying all kinds of combinations of modems/aio's/ and rpm's and I got lucky. 2 days now with a solid signal at all times. LTE speeds are blazing too, 45 down and 10 up.

Check ur imei number. Or flash a backup and see if that fixes ur problem.
Sent from my SCH-I535 using XDA Free mobile app

jayjr1105 said:
Like I said though, I didn't even do this. I was just trying all kinds of combinations of modems/aio's/ and rpm's and I got lucky. 2 days now with a solid signal at all times. LTE speeds are blazing too, 45 down and 10 up.
Click to expand...
Click to collapse
Can you share the specific steps you took? What worked for you and where can we download it from?
thanks!

[Q] anybody else having 4g connection issues?

About 3 weeks ago after installing the update of liquidsmooth 4.4.4 i randomly started dropping to 3g service in places that i normally had full 4g available. It has slowly gotten worse to where if im not on wifi, than the phone is pretty much useless. i normally have full coverage everywhere. so i originally thought that maybe something had gotten messed up on the update, so i did a clean install of liquidsmooth 4.4, and blackbird kernal and same thing still occurred. also tried carbon rom and slimrom, and no luck. so for the fun of it, i went ahead and reflashed the phone back to stock from backups and rerooted it, updated the modems and reinstalled liquidsmooth w/ blackbird kernal, and same thing. i have went through all the mobile networks settings and tried everything and nothing seems to help, idk if that update screwed something up or if its an issue that others have been experiencing as well, or if im just screwed and my phone phone is dying.... any help is appreciated thanks

rideforlife7 said:
About 3 weeks ago after installing the update of liquidsmooth 4.4.4 i randomly started dropping to 3g service in places that i normally had full 4g available. It has slowly gotten worse to where if im not on wifi, than the phone is pretty much useless. i normally have full coverage everywhere. so i originally thought that maybe something had gotten messed up on the update, so i did a clean install of liquidsmooth 4.4, and blackbird kernal and same thing still occurred. also tried carbon rom and slimrom, and no luck. so for the fun of it, i went ahead and reflashed the phone back to stock from backups and rerooted it, updated the modems and reinstalled liquidsmooth w/ blackbird kernal, and same thing. i have went through all the mobile networks settings and tried everything and nothing seems to help, idk if that update screwed something up or if its an issue that others have been experiencing as well, or if im just screwed and my phone phone is dying.... any help is appreciated thanks
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I'm currently running OmniToad, and ran CM 11M8 for a short while. On T-Mobile at least, with the custom ROMs it's normal to see H+ only when data is being transferred; it will drop back to 3G otherwise. When I ran the stock ROM on the Relay, it would always say "4G" regardless of whether it was in UMTS (3G) or HSPA+ mode. Apps like SignalCheck or CellMapper will tell you which mode it is really in.
On the other hand, if data transmission is only going through as 3G, it could be a phone issue or a tower issue. Is LTE available in your area, or are they just getting it set up? I know when T-Mobile was upgrading the Chicago area to provide LTE, there were a few glitches here and there.
It was stupid for T-Mobile to brand HSPA+ as "4G" but that's a different rant.

Bobby Tables said:
I'm currently running OmniToad, and ran CM 11M8 for a short while. On T-Mobile at least, with the custom ROMs it's normal to see H+ only when data is being transferred; it will drop back to 3G otherwise. When I ran the stock ROM on the Relay, it would always say "4G" regardless of whether it was in UMTS (3G) or HSPA+ mode. Apps like SignalCheck or CellMapper will tell you which mode it is really in.
On the other hand, if data transmission is only going through as 3G, it could be a phone issue or a tower issue. Is LTE available in your area, or are they just getting it set up? I know when T-Mobile was upgrading the Chicago area to provide LTE, there were a few glitches here and there.
It was stupid for T-Mobile to brand HSPA+ as "4G" but that's a different rant.
Click to expand...
Click to collapse
yea LTE has been in this area for quite a while now, i had it with my S4 and it worked perfectly, i never had a problem with the service on the relay either up untill a few weeks ago the internet speed and and data coverage was great, not quite as fast as the LTE on my S4 but it was still more than adequate, i used to use the hotspot and stream netflix on my laptop. now i can usually get a text to send but calls usually fail and if i try and use the internet its impossible. it almost seems like its doing the exact opposite of what it should be doing, as soon as i try and use anything (not while connected to wifi) than it drops coverage to 3g/edge/ or to nothing at all. Im leaning towards the hardware failing side, but i figured i might as well give it a shot and post it and see if maybe i wasnt alone. thank you for your reply.
small note of background on me: first time posting ever in this forum but have been using the tools and roms from it for a long time, so im not a complete noob, but i definitely still have a lot to learn.

Not able to make/receive calls when connected to LTE - UK EE network.

Network provider is EE UK.
Sorry for the long post​
I’ve had the 1+ since 2014 now, I am rooted and have used various Android 7 and 8 (recently) roms on the device until recently (probably 7 months ago) my 1+ started playing up. I would not get any signal whilst at work; although the building I work is generally poor with mobile signal however I use to get just enough signals to receive a call.
About 7+ months ago this started fading and I would get 0 bars, at first I thought it’s a modem issue so I tried all the different modems and made notes on which one was the best but in the end none of them helped with the situation. I then did what most people do and googled the issue and found that there are lots of other people with similar issue with the oneplus one not working on LTE, many suggested to make sure I visit the engineering menu *#*#4636*#*# and change the connection to LTE/GSM Auto (PRL), however this was already set and yet it was not making any difference. The main issue was not being able to make or receive calls when the device is connected to LTE.
On the odd occasion I was able to make/receive all on LTE when leaving the building but it would be not stable, at times I would get a call but people could not hear me, then sometime I would dial out and the screen would be stuck at “dialing” and nothing would happen. Then I would try few times and it may work or not work at all. So I switched to GSM only (via the secret menu) and the phone would work perfectly, no issues calling out at my work desk or outside and getting all calls without any issues. The issue with this was that on a reboot the settings would go back to LTE/GSM so it was a constant change. On top not being able to use 4G Data speeds was making life harder.
Even when selecting 3G in network settings the phone would not switch to 3G only. I also tried different network provides like 3 UK, Vodafone but still the same issue.
I’ve now come to a conclusion that this is something software related (perhaps?) as the device is failing to switch to 3G when making/receiving calls. When I check the secret menu I see that DATA and VOICE connection is LTE. Now I know this device does not support VoLTE so I thought it would always first aim to connect to 3G signal?? NO?
As a result i’ve moved to Pixel 2 device because I tried everything from different roms to modems, going back to kitkat, CM12.1 and 13 as well as Oxygen OS but was still getting the same problem.
I’ve also come across posts (on google) that people with different oneplus device are suffering from this so not sure if something has been switched on/off on my phone when flashing different roms to have caused this issue or is this a hardware problem?
I’ve spent numerous hours trying different things suggested by many on google but haven’t got anywhere. I have given up trying to get to the bottom of this.
If anyone is out there who have had this issue and have found a solution please let me know, I still very much like the oneplus but with this issue it’s hard to use the device.
Thank you for reading…..

v1ks said:
Network provider is EE UK.
Sorry for the long post​
I’ve had the 1+ since 2014 now, I am rooted and have used various Android 7 and 8 (recently) roms on the device until recently (probably 7 months ago) my 1+ started playing up. I would not get any signal whilst at work; although the building I work is generally poor with mobile signal however I use to get just enough signals to receive a call.
About 7+ months ago this started fading and I would get 0 bars, at first I thought it’s a modem issue so I tried all the different modems and made notes on which one was the best but in the end none of them helped with the situation. I then did what most people do and googled the issue and found that there are lots of other people with similar issue with the oneplus one not working on LTE, many suggested to make sure I visit the engineering menu *#*#4636*#*# and change the connection to LTE/GSM Auto (PRL), however this was already set and yet it was not making any difference. The main issue was not being able to make or receive calls when the device is connected to LTE.
On the odd occasion I was able to make/receive all on LTE when leaving the building but it would be not stable, at times I would get a call but people could not hear me, then sometime I would dial out and the screen would be stuck at “dialing” and nothing would happen. Then I would try few times and it may work or not work at all. So I switched to GSM only (via the secret menu) and the phone would work perfectly, no issues calling out at my work desk or outside and getting all calls without any issues. The issue with this was that on a reboot the settings would go back to LTE/GSM so it was a constant change. On top not being able to use 4G Data speeds was making life harder.
Even when selecting 3G in network settings the phone would not switch to 3G only. I also tried different network provides like 3 UK, Vodafone but still the same issue.
I’ve now come to a conclusion that this is something software related (perhaps?) as the device is failing to switch to 3G when making/receiving calls. When I check the secret menu I see that DATA and VOICE connection is LTE. Now I know this device does not support VoLTE so I thought it would always first aim to connect to 3G signal?? NO?
As a result i’ve moved to Pixel 2 device because I tried everything from different roms to modems, going back to kitkat, CM12.1 and 13 as well as Oxygen OS but was still getting the same problem.
I’ve also come across posts (on google) that people with different oneplus device are suffering from this so not sure if something has been switched on/off on my phone when flashing different roms to have caused this issue or is this a hardware problem?
I’ve spent numerous hours trying different things suggested by many on google but haven’t got anywhere. I have given up trying to get to the bottom of this.
If anyone is out there who have had this issue and have found a solution please let me know, I still very much like the oneplus but with this issue it’s hard to use the device.
Thank you for reading…..
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I can relate to you. have similar issue and also tried most of the things you have done. don't know what to do. if you have found something, then reply.

I think I have the same issue here in Italy too.
I tried all modems in the list and downgraded to kitkat but with no luck.

same issue reproduced on lineage os 16.0 India /Airtel
nik012003 said:
I think I have the same issue here in Italy too.
I tried all modems in the list and downgraded to kitkat but with no luck.
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No calls incoming/outgoing over LTE network lineage os 16.0, when changed to 2G network calls works just fine
while LTE no issues with Data connectivity .
any luck for anyone.
Thanks

I don't have the phone anymore (in fact, the same issue made me get a new phone), but maybe try updating the modem?