Develop Bugs

No mobile data when leaving wifi.

On different (clean) stock roms, both mm and ll, data doesn't work when I leave my wifi's range. I have to toggle airplane mode to get it to work again. Tried "switch automatically" in wifi settings and "aggressive handover" in developer section. I found g2 and g3 owners with 6th same issue, but u don't find a proper solution, besides managing this using tasker. The issue appeared suddenly and persists on every rom I try. H815

Snap.
Have the same problem with mine.
It seems to eventually pick up data, but this could be anything from 5-30 minutes are leaving the WiFi connection.
Airplane mode on/off fixes it sometimes, but others I have restarted the phone with no change.
Anyone have any ideas how to fix this?
LG G4 H815.
Android 6.0.
Software version V20g-EUR-XX.

Same issue here, which started suddenly with no obvious reason.
Anyone?

H812 Keeps Losing Signal (Please Help)

Hello everyone, I've been lurking here all weekend as I've been trying to stabalize this phone I bought off of Kijiji. Right off the bat, when I
installed the sim I forgot to turn off the phone . Haha, I was extremely tired & only when I removed the battery (of course) did I realize what
had happened. Ever since the sim has been in, the signal has been unstable every 5-10-15 to 30 minutes (this is without running POGO). By
unstable, I mean both data & most importantly calls. I won't be able to make or receive, when I place the call during these failures it will
say dialing, connecting... and just continue until "call ended". And when I"m called, outside of LTE just say we've forwarded your call to VM. On
LTE, it will say something along the lines of this customer isn't able to receive your call at the moment.
Troubleshooting Attempts:
- Tried SIM in a different phone & it worked perfectly
- Power Cycled Several times, Factory reset it 3 times
- Set up 2 APN's (sorry can't link yet, but google them if u like they're ez to find. LG G4 VM Canada APN's)
- ^ Tried both, both unstable, but PDA gives most stability
- I've registered to all available networks under GSM/HSPA/LTE all unstable
- Connected Automatically & Manually to GSM/HSPA/LTE together & separately. All unstable
- Phone is not in Air Plane mode
Model: LGH812
Unlocked, Original Carrier: Rogers
Current Carrier: Virgin Mobile (Canada)
Android OS: Marshmallow
Kernal Version: 3.10.84
Build Number: MRA58K
Software Version: H81220x
Now, I have just recently come across a very interesting development. Using the App Network Signal Refresh Lite,
In pokemon go I've been able to transition to a signal that will stay solid for up to 5 minutes, 3 on average. It will still
lose connection, but will usually reconnect in-app in moments. I do have to minimize it & do a refresh again in NSRL
every now and then but it's a big improvement. Before hand, when I would use go, the service (calls included) would
completely rip in seconds.
So... any ideas? I'll appreciate any & all help.

I've flashed every stock rom I can for the device too, but the signal continues to drop regardless of the OS. Some error messages I' ve gotten are emergency calls only, no service & service disabled but usually it just shows that its connected to virgin but I can't make or receive calls.
Other than the cellular service, everything else with the phone works perfectly. The wifi, the camera, the gps, etc it would be a shame to have to get rid of it but the essentials first. I have to be able to make calls.
Please, anyone, any ideas? Are there any apps I can install to fix the broadband or something.

It won't remain stable no matter what I do... and no one has any solutions
tips, thoughts or ideas? Really regretting this purchase now... It's been a
month and I still cannot get a stable connection. This is ridiculous.

Unoder said:
I've flashed every stock rom I can for the device too, but the signal continues to drop regardless of the OS. Some error messages I' ve gotten are emergency calls only, no service & service disabled but usually it just shows that its connected to virgin but I can't make or receive calls.
Other than the cellular service, everything else with the phone works perfectly. The wifi, the camera, the gps, etc it would be a shame to have to get rid of it but the essentials first. I have to be able to make calls.
Please, anyone, any ideas? Are there any apps I can install to fix the broadband or something.
Click to expand...
Click to collapse
Where did you find the stock rom for virgin mobile?

Unoder said:
It won't remain stable no matter what I do... and no one has any solutions
tips, thoughts or ideas? Really regretting this purchase now... It's been a
month and I still cannot get a stable connection. This is ridiculous.
Click to expand...
Click to collapse
You may want to check out this link (https://lg-firmwares.com/lg-h812-firmwares/) for an H81220X Bell/Virgin kdz (H81220x_00_1122.kdz) and use LGUP-NEW to install it. It might help but if not, you may be facing a hardware issue ...

Solved lg g4 losing signal
I bought my lg g4 K450 and within days l noticed my phone was losing signal constantly. By the grace of God l tried this and it worked.
Go to settings---Then to Network---To more---To Mobile networks----To network operators. Select search network. All available networks will be displayed after a thorough scan. Select your network provider with a WCDMA instead of GSM and it will register it. After it done registering, restart the phone. and u are good to go. It worked for me, if it works for u give glory to God.
By [email protected]
+233202997578

Problem solved
Settings>battery and power savings>battery percentage on the status bar> off

WiFi Broken on D850, Love This Phone Desperate for Help

I have had my ATT LG G3 for almost two years now and enjoyed it very much. I recently paid it off via ATT Next after it stopped working. I am on stock Lollipop 5.0.1, after having factory reset many times. The wifi will either 1) Not turn on when I swipe it on 2) Not display any networks in search 3) Connect to the wifi but not get any internet connection 4) Work fine with no issues. 3) is the most common issue, but the other states occur also. I have tried contacting LG and ATT, to no avail. What can I do? Thanks

Error Searching For Network / Radio Off / No Signal issue

Hi all,
I am using moto z play mobile for past 1 month. i was working fine till today. Now i switched off and turned on back then it unable to find network with both sim cards. It showing " No service" on top and unable to search networks as well(Error searching for networks). When calling it says " Turn off aeroplane mode to make calls" even though aeroplane mode is turned off.
In About Phone> SIM Status>:
Network - Unknown
Network type - Unknown
Service state - Radio Off
Signal Strength - 0dBm 99asu
Network State - Disconnected.
IMEI IS THERE. NOT CORRUPT.
Dialing *#*#4636#*#* :
Pressing Turn On Radio does nothing.
Please help me to solve this issue.
Thanks,
karthik

sim working? not expired?
try the sim with another phone, check if working
restart the z play yet?

Hi,
SIM working on another mobile. I tried restart many times and no luck.

Could it be the same thing that I'm experiencing? This is my second Moto Z Play dual-sim (XT1635-02) after the first one was replaced, because of the same problem. I've noticed that the problem is worse when using 4G, but if you change it to 3G in preferred networktype, it usually stays connected. I'm gonna return my 2nd Moto Z Play again on Monday and buy another phone, I don't want a 3G phone!
See my YouTube video where I've recorded the problem: youtube.com /watch?v=aFWdmmWzxdA
(Just remove the space between .com and /watch to get a functional link)

i suffer same issue and got network back after reflashing and wipe data. but i have to reflash again because i got this issue again. i didnt find the cause of it.

I have exactly the same problem, i think it beggins after install magisk in viper rom, but after return to the last stock firmware, the problem is still present

Hi. Got same issue, after official update - restart, lost network, radio off and unable to turn it on via *#*#4636#*#*.
Phone was on warranty so I gave it to my operator, unfortunately they told me that I will have to pay for screen replacement also because there is tiny scratch on it. Got phone back with network WORKING [ no repair was made ] though that issue is gone until my son drained battery flat, phone restarted with no network. This got me and if I can stick warranty in my ***** I did flash it with lineage ROM and wipe everything from phone, no success at all - I laterally did EVERYTHING what I could [ software wise ] - so I gave up, bought another phone and put this on shelf.
After 2 days got it back form shelf and put sim in and turn on and guess - network worked until I restarted it, no network after restart.
Conclusion:
Modem has to be restarted as battery in no removable You have to switch it off for 12h or so and it should work [ in my case ]

Question Mobile data interruptions on POCO F3 - is there any cure?

Hello, I tried searching on XDA and elsewhere but could not find an answer so I hoping to receive help by writing my issue here.
I have bought two POCO F3's 128GB & 256GB on Amazon & Aliexpress respectively.
They both have the same issue when using mobile data (4g) loading websites and doing voice & | video calls like FB messenger there are interruptions like for a second there is no sound or video freezes. It does not happen on wifi or other phones.
I tried resetting APN, selecting proffered network to LTE, rebooting, switching SIM slot, resetting wifi, mobile and bluetooth settings. Updated both phones to MIUI Global 12.5.1 still no luck.
Country Lithuania (EU) carrier TELE2
We really like the phones, but this is pretty annoying as we do a lot of video calls due to quarantine and what not.
Amazon suggested to replace the phone but seeing as two of them having the same issue it will most likely will not help.
Anyone experienced these issues and came up with solution?

From what u described, seems to me is a bandwidth/mobile data speed problem. Looks like is not enough bandwidth for video call to work properly. So, what is ur bandwidth provided by ISP? What mobile data plan had from ur telephony provider? Maybe ur mobile data signal is low in the place where u make the call from. It can be so many reasons for the issue u confront with, other than a problem with phone itself (a hardware/software issue).

you can also try the latest china stable firmware 12.5.4

Alin45 said:
From what u described, seems to me is a bandwidth/mobile data speed problem. Looks like is not enough bandwidth for video call to work properly. So, what is ur bandwidth provided by ISP? What mobile data plan had from ur telephony provider? Maybe ur mobile data signal is low in the place where u make the call from. It can be so many reasons for the issue u confront with, other than a problem with phone itself (a hardware/software issue).
Click to expand...
Click to collapse
Hi, ty for reply. That should not be an issue, reception is great and we tried it in multiple locations. Our previous devices Iphone 6s/ Poco F1 worked flawlesly with the same carier.
Here is speed test done on mobile data.

Any other ideas?

Found this thread here and I found a solution. Apparently there's an issue with network interruptions in general, especially on phone calls. This can be avoided by switching on VoLTE and WiFi-Calling. This is what I found out over time.
Here's the fun part though: Through a little bit of research this turned out to be a vodafone-problem. I am just guessing you guys will be either also on vodafone or on the corresponding bandwidth in your country.
It seems to be a bug in the F3, but also something that happens when VoLTE is not activated for your SIM card. The phone will try to use VoLTE and this connection will fail, forcing the connection to reset. It will be back in 10-20 seconds, but this is of course super annoying whenever a stable connection is needed (like phone calls...)
Enter *#*#86583#*#* (86583 = VOLTE on dialpad) on your phone. and it will give you a feedback that the carrier check has been disabled. Note that this doesn't mean that VoLTE has been disabled. Checking the network for the capability is disabled then, which makes the setting visible on the SIM card settings. Same works for VoWifi btw.
Try playing around with those settings and see if the connection drops persist. I have no logical explanation why this is happening because what I am telling you is obviously call-related - and I do realize that what you're describing is about the data connection. For me this was related however and solved my issue.
Possible solutions:
a) try to get your service provider to switch on VoLTE for you (this worked for me). You're going to need to call support for that. They will reset your SIM card in the process. Reboot your phone and be done with it.
b) If a) is not possible, deactivate VoLTE in the menu that you activated with the code above. If you're lucky, this will stop the phone from trying to get this type of connection working, even though it's not available. This is broken exception-handling on the phone's side and Xiaomi promised to fix it. They are aware of the bug (since Aug 20th btw) and promised to push a fix into the next MIUI release
c) play with the settings and try to get the phone to not use alternative protocols, just 3G and 4G, also deactivate Wifi-Calling.
Hope this information will help somebody. If all goes well, Xiaomi will fix it and this will behavior will be gone in the next release.

same issue for me with 12.5.7
data interruptions all the time and full signal loss
very disappointed with this device from the day i got it.

O thought I'm the only one facing this problem.
It's so annoying to get an interrupted connection in the middle of the game.

not only game, and calls, i have too much trouble to get throught a call.

Hello all,
i was also affected by a similar issue.
In my case the symptoms were:
On mobile data/5G some apps would be accessing the internet but others wont..
I was able to overcome this by resetting the access point settings and then applying the ones found here:
Cytamobile-Vodafone Cyprus APN Settings for Xiaomi Poco F3 GT - APN Settings
apn.how
I hope it helps...

My fix for this occasional issue is to set the phone to '3g' only in network settings, then flick it back to '5g'. It seems to be area specific for me. Very bizarre.

ntemis021 said:
not only game, and calls, i have too much trouble to get throught a call.
Click to expand...
Click to collapse
I have the same problem, it helps to have the settings volte and vowifi enabled. Sometimes it looks low cell signal and loosing the connection.
Has anyone return for service the device?

It looks like we still have this problem, my F3 modem is crashing every few hours especially when it switches bands, very annoying.

Magister54 said:
It looks like we still have this problem, my F3 modem is crashing every few hours especially when it switches bands, very annoying.
Click to expand...
Click to collapse
It really is! We need a bug bounty for this

Hey I ran into the same problem in Hungary Vodafone Poco F3, 14.07 MIUI
4g net is working flawlessly but
Network connection is lost when start dialing
Nobody can reach me on phone
Enter *#*#86583#*#* (86583 = VOLTE on dialpad)
VoLTE select option turn on/off
Enter *#*#869434#*#*
VoWiFi select option turn on/off
I tried to switch on/off both but no solution just yet
sby has answer for this?
Where should I post this problem to be solved?

I also have this problem and I am from Iran. My mobile ROM is the global version. It seems that this problem is caused by the Poco F3 mobile hardware itself. If anyone finds a solution, please let me know, thanks.