Develop Bugs

Mobile Network Drop

Not sure if anyone else has had this problem but i randomly get mobile network drops once or twice a week. The phone works perfectly well but the mobile network just drops, you cannot scan for network at all. The only way i have found around it is to enable plane mode to drop all connections and then turn plane mode back off so the network starts up. This often takes between 5 - 10 mins for it to kick in.
Tried two roms but now back to stock but still happening.

Have you tried flashing the latest radio? They are listed in the dev section.

The recent OTA 1.21.405.2 update included a new radio I think. Did you put this on too?
Since then, I have also been having the network drop out. I am missing a lot of calls as a result. Prior to this update I had two months of problem-free operation on my stock 2.1 ROM.
From reading the google forums, this is a wide-spread issue. The light at the end of the tunnel seems to be that people updating to 2.2 froyo seem to see the problem stop. Two weeks to wait for us stock ROM boys according to the rumours then! Fingers crossed.
It's a bit embarrassing having this flashy toy when it struggles to be a phone at random intervals. At the weekend one of my less techy friends was waving his Nokia 6210i in my face saying, "At least I can make and recieve calls!". So I changed the language on his phone to Turkish when he left it lying about. The old ones are the best.
I am going to test the 1.21.405.2 theory by doing a factory reset later this week when I have time. Problem should persist if it is the new radio. Will post back with the results.

OK did a factory reset this morning. I left all my apps off, and did not set back up any google account business. I basically left it as a standard mobile phone.
Within 7 hours, guess what....yes it's lost the connection again. Strongly believe this is a radio problem. I'm too noob to know if I can flash the radio without rooting. Anyone?
I have since submitted my complaint with HTC CS. Will await their response, and post it here.
In the interim, turning airplane mode off and on again does regain the connection, and I have installed an app from the market place called "No Coverage Alert". It will now beep and buzz if I loose the connection so at least I will be aware every time it bombs out. Far from ideal but should do for now.
Watch this space.

Yes i have tried the two radios posted but i havent tried any international ones such as europe or asia. I still randomly get network drop and i need to turn radio off and back on again for it to pick up.
Maybe i should ask a chef if these drops are logged anywhere on the device so i can root in and look at the logs myself and diagnose what the network drop is on my phone.
Just to confirm, tried multiple radios and roms, i know exactly what i am doing all i would like is explaination of why it happens. It is not user error as i have tried with stock rom, no fancy apps etc to stop it from working or changing config.
its got something to do with the network radio libs that need a service restart. i am 100% sure if i rooted in and knew which service to restart it would work also

Erm.... this is a little embarrassing but I feel I need to own up to prevent misleading anyone. I have arranged with HTC customer support to send my Desire back for repair. They pick it up Monday.
I bought a cheap £10 phone to keep me going. It arrived this morning. After I had finished laughing at it, I put the SIM card in and powered up the phone.
"No SIM card instered" was the message it greeted me with. After numerous power-up and power downs, and some SIM card hoakee-coakee, it finally recognised the SIM card......then dropped the signal to Orange. EXACTLY what my HTC Desire did.
Doh.
I had tried the SIM card in another phone (my girlfriends Blackberry) when the problems first started and it had worked straight away. But the SIM card seems to be random in it's failures. Should have tested more rigorously.
Sorry guys but in my instance it seems I have simply a faulty SIM card. The first one I have ever had go wrong in 12 years, but there you go. I was too fast to blame Android/HTC.
A|ex, please try your SIM card in another handset. Do several power-ups to see if it goes wrong. Would explain why trying numerous radios/ROMs has not helped you.
Let me know?

I had the same issue. Talked all day and evening, then toyed around with the phone a little, flashed a new ROM, no connection. oO okay, that's weird. Tried 3 different ROMs, reset to factory settings. Went to Orange, the SIM was borked. Thankfully, getting a new one took all of 5 minutes and didn't cost me a dime.

Yep. Was the SIM card. The new one arrived from Orange this morning. Popped it in and it's working straight away. My 3G has even improved slightly I reckon.
Six hours of use and not one drop yet.
Thank god for that.

[Q] No Service.. anywhere.

So my wifes phone no longer likes to be bothered with phone calls or text messages. Her phone has been running flawlessly since we got it and about a month ago she dropped it and cracked the screen. It was too the point where the touch screen wouldn't respond to anything and we had to have it fixed. She took it to one of those places in the mall and they said they could have it back to us in a week or so. Once she got it back, she has had constant issues with not being able to connect to the Sprint Network (only for phone calls, data and wifi still work fine). She often roams but still with very little signal strength. She tried a factory reset, as per the Sprint Customer Service suggestion, and it did nothing. She had remained Unrooted up until this point and I finally convinced her to come to the dark side. I did the root, installed TWRP, and flashed her with Optimus DE. I got no change. I reflashed her Radio. Still nothing. I am at Wits end on this one and ask for some guidance. It would be much appreciated
(ps. She doesn't have insurance on her phone.)

iam87x said:
So my wifes phone no longer likes to be bothered with phone calls or text messages. Her phone has been running flawlessly since we got it and about a month ago she dropped it and cracked the screen. It was too the point where the touch screen wouldn't respond to anything and we had to have it fixed. She took it to one of those places in the mall and they said they could have it back to us in a week or so. Once she got it back, she has had constant issues with not being able to connect to the Sprint Network (only for phone calls, data and wifi still work fine). She often roams but still with very little signal strength. She tried a factory reset, as per the Sprint Customer Service suggestion, and it did nothing. She had remained Unrooted up until this point and I finally convinced her to come to the dark side. I did the root, installed TWRP, and flashed her with Optimus DE. I got no change. I reflashed her Radio. Still nothing. I am at Wits end on this one and ask for some guidance. It would be much appreciated
(ps. She doesn't have insurance on her phone.)
Click to expand...
Click to collapse
It sounds like the antenna may not have been reconnected upon completion of the screen replacement. At this point though I would attempt a PRL and profile update for the phone. If that still doesn't work I would take it back to the repair shop and request they check the antenna since it was working before the repair.

This ^^^^ And also, Optimus DE can have weaker signal. Try a Stock ish ROM. You can also try going to Settings>About>More>Mobile Networks and check CDMA. It can help too.
Sent from my LG-LS970 using XDA Premium 4 mobile app

Thanks for the suggestions, I will let her know about the antenna issue, that sounds like it possibly could be the case. I tried Stocktimus as well as Optimus DE, I just forgot to mention it. I chose the most basic (closest to Stock option) it had.
Also, I tried the PRL and Profile update and it had no change in signal.
Thanks for the replies.

[Q] Drops off network suggestions? -Samsung Note 2 - Wind mobile SGH 889v

So for the past year or so I've seen instances where my phone shows 5 bars and data, however calls go to my voicemail. I find out when I do something with the phone that forces it to rejoin the network.
I've got a 3rd party number that my enterphone uses, that number rings both my wife's phone and my phone at the same time. However very often only her phone rings, both of us appear to have good signals.
It seems that my phone is falling off the network but not showing this fact. If I switch to and from airplane mode it seems to regain network, or if I try to make a call it will fail the first time but work afterwards.
Any suggestion? I already installed Cyanogen about a month back hoping that this would resolve the problem, however it didn't have any impact. Same problems as before...
I'm wondering if flashing the radio would help, if so which files should I use?
I actually gave up on this phone and ordered a oneplus one, however that one arrived completely broken so now I'm stuck with the note 2 until that RMA gets approved or I get frustrated and just buy another phone.
Thanks in advance.
Gary

Edge / GSM only, hardly 3G/LTE possible

Hey,
since a few days, I'm not able to access 3G/LTE anymore in Germany with European G4 H815. Bootloader is unlocked (so no warranty for me).
I already reflashed it with KDZ with CSE flash, also tried to enable/reflash LTE Bands described here:
http://forum.xda-developers.com/g4/general/guide-enabling-lte-bands-t3137818
2G/GSM/Edge is possible, not more. Forcing the network to use 3G only results in no connection to the network.
Tried also swapping SIM cards with my GFs smartphone, her SIM card can also only get GSM in my G4, my SIM card can easily get H+ on her smartphone.
May this be a defective modem, or maybe a software bug? I flashed Genisys Rom, now back to stock.
Help would be greatly appreciated! Any thoughts?
Kind regards

Have you tried erasing and then adding in a new APN? If it worked prior this would be a good starting place

Thanks for the answer! Yes, I tried any possible APN configuration.

On my wife's h815 I can't test this as access is denied, but your on genisys ROM so it may let you
Open the dialer and type
*#*#4636#*#*

Hey,
I tried it, but could not click Phone Info. Error message is:
This application does not work on this device.
When I first rooted the G4, I backuped all system partitions. Maybe I should try to revert them all? I already tried to restore MODEM, MODEMST1 and MODEMST2.
Or could this be dangerous?
Kind regards

Yeah same with my wife's phone, it's strange were locked out there..
Restoring those partitions shouldn't hurt anything but I'm not very familiar with this phone so can't attest to anything for sure and the wife is on holiday so I can't check her phone
When you went through apns, did you try to first erase them all completely? If not try that, then make a new one

Yeah, I've got only one APN. I also requested a new one by my provider via SMS.
I wonder if the modem itself is defective. Maybe it got fried by wireless charging, I'm using a chinese Qi-Sticker and replaced the original one.
Are you using wireless charging?

No, just a cheap dock, but as far as I know that won't fry the internals or interfere with the radio at all
The reason I keep asking if you fully erased all apns and start over is I had to do this with a 2013 motox when it switched to lollipop, for some reason all apns had to be erased and then readded to get lte/3g to work again, the phone was stuck on edge just like yours

Okay, I found out by chance today, that there is 3G/HSPA reception possible. I was standing outside 100m away from a cell tower, and had medium reception. Maybe there is a problem with the internal antenna?
Oh, and by the way, I can see LTE network here at home (but no HSPA), but don't have a LTE contract, so I can't connect to it.
Maybe next time, when you are next to a cell tower, you try it yourself?

I haven't found a solution.
LG refuses to repair to my G4 for free, but I buyed the phone at Amazon (De). I called the hotline, they cover the warranty for 2 years, so today I sent the phone in for repair.
I'll keep you updated if Amazon repairs it despite the bootloader being unlocked (I told them before).
Sorry I couldn't offer a technical solution for anyone with the same problem

This is what happened in the meantime:
I sent the phone to an Amazon Partner Service Center. They refused to repair it under warranty - Bootloader unlocked. They offered me to replace the motherboard with a new one - 283€ incl shipping
After that offer, I called Amazon that their partner would not repair the phone under warranty.
They then sent me a brand new G4 for free! After I already had received the new unit from Amazon, of course I had to send back the defective G4 (when it came 10 days later from the repair service).

My friend has exactly the same problem.
Bootloader is unlocked. Tried to go back to stock MM 20c firmware from Imperium v1 Rom, but that didn't work. Also no update to 20d is offered by LG. If i force to use 3G, the phone can't connect to the cell network. Only edge does work. APN looks also good. Furthermore i tried to flash a new/other modem, but that didn't work also :/
Does someone have any suggestions to fix this problem?
@t000x: Was unlocked bootloader and therefore no warranty no problem for amazon.de?

Hi hasenbolle,
try restoring the firmware first, before shipping it back:
http://forum.xda-developers.com/g4/general/guide-lg-g4-stock-firmware-to-stock-kdz-t3107848
Yes, Amazon gave me a new unit despite the bootloader being unlocked.
But first I had to send it to their partner service Center and wait a few days.
Good luck with that phone.

Signal drop

Hi all,
A couple of weeks back I had to have my z2 repaired since it suddenly lost service. Since I bought it abroad there's no local official support and I had to trust in unofficial service. They supposedly changed the antenna board or something like that (they were very non-specific on the description of the fix). The phone was working correctly afterwards.
However I started to notice that, when not on wifi, the phone looses signal periodically, not only internet but phone and sms as well.
I'm planning on sending it back for repair though I don't look forward to doing it so. It just occurred to me that maybe they put the replacement part from a different model (mine is xt1710-09) and that my current stock image has problems with this spare part, baseband configuration or something. Is this really possible? I've already wiped completely but it remains the same.
I'm thinking on flashing a different stock version for another model (retail us, or retail br). But don't know if that's a good idea though.
Any thoughts or ideas?
Thanks!