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[Q] Roaming when on Custom rom

When I'm on stock (d80020k) 4.4.2 I get nearly excellent (4-5 bars) 4g data performance. However, when I try any custom rom, my bars always show "R" which I believe is roaming by them. I'm currently on Mahdi rom with the d800 patch. When I go back to stock using the twrp backup, everything works fine again. Can anyone help me as I'd really like to stay on a custom rom. My Sim card is for a T-Mobile mvno called lycamobile. My phone is unlocked so it should be working. I have a speculation that this might be because of my service provider.

No one wants to shed some light on this? This didn't work on jellybean and Kitkat, both being different devices on the same provider.

Update: My provider says that on some devices, it shows that it's roaming on it's own network, and for that reason, roaming is the same price as regular. However, I don't yet understand why it doesn't show roaming and works fine on stock, yet always, always roams on aosp/cm. However, I'm terribly confused why It roams on aosp/cm. I tried changing network operator to Lycamobile, still roaming. I found out that the roaming "R" is completely cosmetic, as I can make and receive calls, make and receive texts, and use data. Is there any mods to replace the R with like 4g lte or something? It really bugs me when I can't see the speed of data when I'm using it.

Cell service won't connect when roaming with Lineage OS on Sprint, works with stock

This is a Galaxy S5 on the Sprint Network with Lineage OS version from a few weeks ago.
Last week this was working fine and then since Sunday cell service stopped working completely. The only change I did was updating TWRP, I did not update LineageOS, but I can't imagine TWRP would have affected it. I ended up reverting back to the stock ROM thinking I would have to call Srpint customer service, but then it started working under the stock ROM. Reflashed TWRP and Lineage OS and no service. Tried older and newest versions of TWRP and Lineage OS but nothing works except stock ROM (yuck).
The cellular connection says "no service" with completely empty bars. About every 5 seconds it will flash like it is connected, with most bars and the little R for roaming, then immediately goes back to "no service". I've tried changing preferred networks and looked at settings but can't find anything to fix it.
Any ideas? It's almost like the network is rejecting it but I don't see why it would matter if it is a custom ROM.
EDIT: oh yeah and on start up it says "Activating cellular service... This may take up to 5 minutes" or and then after a while says "Couldn't Activate" and that it may be fixed by restarting the phone (which of course doesn't fix it). Also I'm not entirely sure if it is related to roaming or not.
EDIT2: I'm wondering/betting this has something to do with the ICCID number. I noticed with Lineage OS installed it says "DUMMY_NV_ICC_SERIAL" but with the stock ROM it is a long string of digits. Now maybe I can change the ICCID on Lineage OS? Or maybe Lineage OS isn't reading my sim card properly (from googling what ICCID is)?

Did you ever figure this out? I have the same issue. Until the most recent build, I was forcing the phone down to 3G because of the SMS bug, but now that I have it set to use LTE, it won't connect (even to fallback, I don't care about getting LTE, I would just like not to miss calls/texts because I do have voice roaming).

Firstly, check the baseband, if it's the newest. Sometimes this causes the problem. If this doesn't help, then only the ROM is the actual problem.

bussemac said:
Did you ever figure this out? I have the same issue. Until the most recent build, I was forcing the phone down to 3G because of the SMS bug, but now that I have it set to use LTE, it won't connect (even to fallback, I don't care about getting LTE, I would just like not to miss calls/texts because I do have voice roaming).
Click to expand...
Click to collapse
I did not figure it out. I went back to my home area, re-installed LineageOS and then it activated on the Sprint network fine. But I suspect if I was in roaming again it would still not work if I did a factory reset or an update while in roaming. So I guess the only "solution" I've found is to be on a home network, let the phone activate, and then you can go back to roaming area. Not much of a solution if you are not near a home area.

I use https://forum.xda-developers.com/xposed/modules/app-roaming-control-v1-0-t3267154 to re-enable national roaming.
Also had some problems getting the modul work. I had to enable modul by toggle flight mod. Also i still have to enable roaming befor i switch from wifi to data connection then i can turn roaming (international) in system off and national roaming still works.
Maybe you have to do so :fingers-crossed:

S8 signal loss in large buildings - other phones have 4G LTE with same sim card

I've been back and forth with Samsung over this. My new S8 (the unlocked USA version, SM-G950U1) has a poor signal in some office buildings, frequently losing signal entirely. Other phones at the same time and place have a strong signal with 4G LTE service. We've tried reflashing the software, changing the sim card, and booting it in safe mode. The same sim card in a different phone gets a signal. I've run Open Signal on multiple phones at the same time to compare results and to show to service reps so they can see what's happening, though that gets me no closer to understanding the source of this problem.
In most places, this S8 works fine and has a great signal. Any thoughts about what could be causing it? Has anyone else experienced this?
Due to summer travel, I didn't catch the problem until after my 14-day return period. Samsung claims I need to mail them the defective one "for repair" and plan to be without my phone for 9-11 days, which seems absolutely crazy to me. (I made a big fuss and they offered to expedite it, but that's still 5 days without my phone.) Looking for last-ditch suggestions... anyone? Thank you!
Edit - more technical details including network screenshots posted here: https://forum.xda-developers.com/galaxy-s8/help/galaxy-s8-unlocked-sm-g950u-maintaining-t3680887

Had the same issue. Had to have to repaired.
They changed everything except the screen and frame.
The issue occured after a software update. After repairs the issue returned after the Orea update... but isnt as bad as before. I seem to have lost Band 5.. 850Mhz

My phone also *just* updated to Oreo, and I think the problem may be back in a milder form. I haven't had a chance to really test or debug it, yet.
My best theory has been that the phone was prioritizing non-LTE signals over a weak LTE signal. How I fixed it the first time: enter the BAND service mode via the native dialer by dialing *#2263# (2263 spells BAND). Clear all bands, then select all LTE bands (ONLY LTE) and apply the changes. This forces the phone to use only LTE signals, no matter their strength. It's worth noting that you may need to alter this when traveling through areas without LTE service, by re-entering the menu and selecting all bands and applying the changes.
Good luck! Please let me know if you figure anything out with your phone after its oreo update!

It is because you will not be on the network band that is stronger
Since flashing my phone back to Nougat I still cannot enable band 20 which I need for better signal. So I’m stuck with poor signal

wezzel98765 said:
It is because you will not be on the network band that is stronger
Since flashing my phone back to Nougat I still cannot enable band 20 which I need for better signal. So I’m stuck with poor signal
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Click to collapse
Are you using the unlocked USA version, SM-G950U1 ? If you load the *#2263# service menu, you can't enable/disable LTE band 20?
If that's the case, I'm not sure why that's happening! When you flashed back to Nougat, did that include a flash back to the baseband you were previously on?

I'm using the g950F from UK unlocked to all networks
Almost all networks rely very heavily on Band 20 in my town to provide good coverage- so with our It I have a major problem

Facing same issue - loss of lte signal - s8+ switching to weaker lte band
Just got the S8+ and updated it to the latest OREO. After detailed diagnosis using service codes, the issue is that the phone is definitely prioritize a weaker LTE BAND Signal during radio activity with the network tower.
Getting full signals on with the same SIM card on other phones.
The new service mode is also not operable or I don't know the key yet. Using *#0011# only shows the SERVICE MODE (Stack 1 & Stack 2), but is not navigable using the Q0 and Q 0000 keys.
Anyone found a solution to this problem or do we have to wait for an update to fix this?

Enter the BAND service mode menu via the native dialer by dialing *#2263#
(2263 spells BAND)
If this doesn't work, what android software build are you running? (It still works for me, on my S8, running oreo G950U1UES5CRL2 )

Solved - jan security patch update
Hi, Just got the update for the JAN SECURITY PATCH UPDATE.
Its working fine now. They fixed the bug. So relieved, finally able to use the handset properly now.
Cheers!
dovesong said:
Enter the BAND service mode menu via the native dialer by dialing *#2263#
(2263 spells BAND)
If this doesn't work, what android software build are you running? (It still works for me, on my S8, running oreo G950U1UES5CRL2 )
Click to expand...
Click to collapse

That's excellent! And also interesting; I'm still waiting for my Jan update, and I'm hoping the delay means it will be my PIE upgrade... *crosses fingers*

Emergency calls only/LTE data, or voice and limited to 3G data? Sprint

I had my phone running PureNexus(7.1.2?) on Cricket with no issues, a couple days ago at the same time as switching to Sprint, I decided to update my ROM, went with a 8.1 ROM. When I did this, I had issues getting any sort of signal to work right, so I figured it was something with the custom ROM, grabbed the latest stock and reflashed. I then went through the same thing many others have here, but when I go back to the custom 8.1 ROM, I do not get LTE to connect, just 3G. Even erasing modemst1 and 2, it does not connect to LTE. So, ignoring that, I still backed up the EFS and restored it over the stock ROM. Doing this, I'm able to get 3G and voice to connect, but when I go into the phone menu(*#*#4636*#*#) and turn the radio off then back on, eventually it will connect to LTE. But in doing so, it puts the phone in 'emergency calls only' for voice. Currently it shows
Voice Service: In Service
Data Service: Connected
Voice Network Type: 1xRTT
Data Network Type: eHRPD
And if I go into the menu and toggle the Mobile Radio Power, it will change to:
Voice Service: Emergency Calls Only
Data Service: Connected
Voice Network Type: Unknown
Data Network Type: LTE
Once it goes to LTE, it does not go back to voice/3G even on reboot unless I erase the modem or restore an EFS backup. I've been able to replicate this 3 times now in 3 different 7.1.2 ROMs, anything 8.1 I've only been able to get 3G working. In 7.1.2 I am able to run the update device configuration, and update PRL. Both work successfully, but it still does the same thing. At this point, I know that the hardware works, as both do work fine, just not at the same time. LTE and voice does still work fine on Cricket, I put in another active SIM and both work as expected. Anyone know what else I could try?
Sorry if this is rambling, I actually had a much more detailed post then somehow refreshed my screen and lost it all

I'm essentially having the same issue with my Moto g5 plus on Verizon. Read my post!

I am having a similar issue on Sprint as well. For a little while I couldn't get 8.1 ROMs to connect to data at all, after serial flashing a bunch of them I ended up with data again accross all ROMs but now I only have LTE, it does not switch to 3 g ever, only 1x when making phone calls. I wish I knew which ROMs I flashed to get to this point but I can't remember anymore. Good luck.

emraith said:
I had my phone running PureNexus(7.1.2?) on Cricket with no issues, a couple days ago at the same time as switching to Sprint, I decided to update my ROM, went with a 8.1 ROM. When I did this, I had issues getting any sort of signal to work right, so I figured it was something with the custom ROM, grabbed the latest stock and reflashed. I then went through the same thing many others have here, but when I go back to the custom 8.1 ROM, I do not get LTE to connect, just 3G. Even erasing modemst1 and 2, it does not connect to LTE. So, ignoring that, I still backed up the EFS and restored it over the stock ROM. Doing this, I'm able to get 3G and voice to connect, but when I go into the phone menu(*#*#4636*#*#) and turn the radio off then back on, eventually it will connect to LTE. But in doing so, it puts the phone in 'emergency calls only' for voice. Currently it shows
Voice Service: In Service
Data Service: Connected
Voice Network Type: 1xRTT
Data Network Type: eHRPD
And if I go into the menu and toggle the Mobile Radio Power, it will change to:
Voice Service: Emergency Calls Only
Data Service: Connected
Voice Network Type: Unknown
Data Network Type: LTE
Once it goes to LTE, it does not go back to voice/3G even on reboot unless I erase the modem or restore an EFS backup. I've been able to replicate this 3 times now in 3 different 7.1.2 ROMs, anything 8.1 I've only been able to get 3G working. In 7.1.2 I am able to run the update device configuration, and update PRL. Both work successfully, but it still does the same thing. At this point, I know that the hardware works, as both do work fine, just not at the same time. LTE and voice does still work fine on Cricket, I put in another active SIM and both work as expected. Anyone know what else I could try?
Sorry if this is rambling, I actually had a much more detailed post then somehow refreshed my screen and lost it all
Click to expand...
Click to collapse
Your problem is really simular to mine, but I have an axon 7 and the service is Total wireless (verizon). I can get data and calls are emergency only. Its very odd, the other odd thing is I have 2 axon 7 (got a replacement). The one with the problem has everything working and the kicker is I restored this replacement to match the working one. So why It cant connect is really odd.

madhits45 said:
Your problem is really simular to mine, but I have an axon 7 and the service is Total wireless (verizon). I can get data and calls are emergency only. Its very odd, the other odd thing is I have 2 axon 7 (got a replacement). The one with the problem has everything working and the kicker is I restored this replacement to match the working one. So why It cant connect is really odd.
Click to expand...
Click to collapse
How is this similar? You are trying to use an Axon 7 on Verizon's network... How do you expect that to work? The Axon 7 doesn't have a CDMA radio.

acejavelin said:
How is this similar? You are trying to use an Axon 7 on Verizon's network... How do you expect that to work? The Axon 7 doesn't have a CDMA radio.
Click to expand...
Click to collapse
Yes it does have CDMA. Its just not officially supported by verizon. I found out that my modem partition I believe EFS was messed up and that contributed to the emergency calls only issue. I never got it fixed even through multiple re-flashes so I simply sent it back to ZTE.

madhits45 said:
Yes it does have CDMA. Its just not officially supported by verizon. I found out that my modem partition I believe EFS was messed up and that contributed to the emergency calls only issue. I never got it fixed even through multiple re-flashes so I simply sent it back to ZTE.
Click to expand...
Click to collapse
I stand corrected... I assume you have seen this, especially post #3?

acejavelin said:
I stand corrected... I assume you have seen this, especially post #3?
Click to expand...
Click to collapse
I have read that thanks for pointing it out. I actually could offer a correction to what he says because you can get VoLTE on the axon7 with verizon but its tricky. I had to activate the phone on an HD voice 1.0 phone iphone 6 or newer and prob other models. I have total wireless (verizon Mvno) once I do that I can swap the sim and get VoLTE on the axon7 through turning it on in test mode. Ive had volte working for a while now. I believe verizon just thinks Im on the iphone6. and I dont know what would happen if I took the iphone 6 and tried to use it on another verizon account as my service is prob tied to its IMEI.

Call/LTE issues on H918

Hi everyone. I decided to root my H918 from 10t by using lafsploit. At this time, my calls, LTE, and SMS were all working perfectly. After downgrading to 10p and unlocking bootloader, the device had difficulty staying connected to a single tower. it kept dropping signal often and was not able to make outgoing calls or stay connected to LTE for too long. After this I flashed LineageOS 15.1, not thinking much about it. On LineageOS, every time an outgoing call was made, it would drop the signal for about a minute. If no calls are made, LTE and SMS sort of work. I flashed 10u stock after that with Magisk and the phone has difficulty connecting to LTE or making calls/sending SMS. I have tried the following:
- Reboot
- Clean flash
- Format where you type "yes"
- APN settings
- Network mode change
- Airplane mode on/off
Somehow after a reboot (on Stock 10u zip) I'm able to make 1 or 2 calls and then it stops working. I called the carrier and they said there are no outages in my area.
I put my SIM in another TMO phone and it worked perfectly. I put their TMO sim in my phone and it had difficulties making calls. So the possibility of it being a sim issue is ruled out most probably. I have been recommended by a few people to try and flash an h918 modem but 1. Not sure if it is safe and 2. Not sure where to source it from. I have no other ideas and this is my primary phone so I'm having difficulties without a usable phone. Any suggestions would be hugely appreciated. Thank you.
Update: Tried flashing to 10p kdz from download mode but didnt solve anything.

Is the wifi also on?

I'm having the same problem, but was running on 10j. I went back to stock and upgraded to 10u to see if it fixes the signal problems I have with this phone. Both Cell signal and GPS on this lg v20 are horrible. On using the h918 on at&t. If not, i will either need to go back to my moto x pure or maybe buy the international note 9 with the unlocked bootloader.

androiddiego said:
Is the wifi also on?
Click to expand...
Click to collapse
The Wifi is on, but I also tried with the wifi off as well as turning off wifi calling, Volte, etc.

Alibaba0101 said:
I'm having the same problem, but was running on 10j. I went back to stock and upgraded to 10u to see if it fixes the signal problems I have with this phone. Both Cell signal and GPS on this lg v20 are horrible. On using the h918 on at&t. If not, i will either need to go back to my moto x pure or maybe buy the international note 9 with the unlocked bootloader.
Click to expand...
Click to collapse
I tried the same. Just flashed a 10p kdz to see if that would fix it, but no luck. Same issue happening on complete stock OS..

I replaced my sim yesterday, but that didn't make any difference. Before that i replaced the plastic bits on the top and bottom of the phone where the antennae contacts with.
I went back to 10j yesterday which was still arb0 and now upgraded to 10u which is arb1. I'll miss lineage, but i was just having too many problems with it. Not sure what at&t has on band 30, that's the only band this phone is missing. I regularly was losing signal while just driving on the freeway.

Hello. I have the same issue on LineageOS. Been trying to fix it but no hope. But I did find a temporary solution. Let me describe the problem. I'm having a LTE sim that works just fine, then it just stop working. The problem is when you enter an arena without LTE or the LTE is too weak at that point then your cell signal is laggy and lost completely. But you can switch the Preffered Network Type in the Settings to WCDMA/GSM/CDMA and your cell signal is back. That's my solution for now. Hope It helps.

With a custom rom, you can't have wifi on with data on. Simply turning wifi off doesn't fix the problem. You would need to reboot. This has been a problem from the beginning. It works with a totally stock phone, but beyond that, no.
Here is the only way to keep data calls working properly: If you need wifi, turn on airplane mode, then turn on wifi. When you are done, turn off wifi, then turn off airplane mode to bring data back.

Not sure the signal is any better with the new firmware on 10u, but at least my location services is behaving better and the camera actually works in stock. I did a side by side comparison of the gps signal with my moto x pure. Side by side the moto x pure got to an accuracy of 10ft with 21 satellites in view. The lg v20 locked on much slower to 8 satellites with an accuracy of 50 ft.
For comparison -
satellite 14 signal strength
moto x pure 34
lg v20 23
the cell signal may be better with fewer drops, but in some places without lte the speed and throughput is miserable.