I am able to use the "2G only" mode on my phone, the LTE refuses to work. If I switch it to LTE/3G/2G (auto connect) mode, it tries connecting for a while (signal bars fluctuate a little) and then it falls back to EDGE (which actually doesn't work - just shows up - until I switch it to the 2G only mode). The phone overheats when it is on LTE/3G/2G (processor temp 75 C or more). There has been an instance when I saw the 4G LTE signal for 5 seconds and then it vanished.
I am able to use 4G LTE properly in another phone with the same SIM card (Motorola Moto X 1st gen) and it works flawlessly. It has the above problem on the S6 Edge, though.
Tried contacting T-Mobile but other than noob reset steps they didn't help much, and when they realized that basic troubleshooting is not going to fix it, they hung up on me.
I think it might be a firmware issue. I cannot recall for sure, but this began soon after I updated the OS to 6.0.1 and I can see a lot of devices having the issue after this update. Is there any way to flash firmware without knocking off the KNOX warranty?
As of now, my device is a wi-fi only brick which is as good as a 2006 tablet.
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Hi all,
I got my Desire from the British carrier "Three" last April when it came out. It was stocked with Android 2.1 but the phone was unbranded and not locked so making life much easier.
I rooted the phone weeks later and flashed a number of various roms and radios (usually newest ones recommended by rom developers) and just played around with them. No problems ever occured and everything went smooth.
However a while ago (about 4 weeks I would say) strange thing happened: when the carrier 3 does not gave 3G coverage it usually switches to other network's 2G roaming service. It is also possible to switch to 2G permanently by forcing it via phone settings. It stopped working in Central London for me while still worked elsewhere (very strange) so I had to rely only on 3G service. I thought it was a network issue at first but now I'm not sure.
Later (or at least so I noticed) the connectivity started fooling around: even when standstill (i.e. NOT in a train, bus etc.) and staying at home the network connectivity just disappears all of a sudden. Sometimes it comes back by itself and sometimes I just do it manually via netowking settings. This is much more common when on the move (i.e. on the train etc. even though it never used to happen before). Moreover, sometimes while manually searching for network it says "your sim would not allow to connect to this network" even though I try to connect to the correct one. Instead I switch "WCDMA only" and "WCDMA/GSM auto" options and connection comes back by itself. Then it disappears again after a while. Even more strangely, connection does not disappear if I am talking on the phone with someone but in other situations (such as browsing internet) it just disappears and I see no bars in network reception indicator and cannot connect to internet or make phone calls.
I know 3 has a reputation (deserved or not) of having "bad" network but I don't think this has anything to do with that. My Desire used to work fine before and never had such problems (except in specific spots which have bad coverage). Moreover, I have another old phone and it works fine without any problems with networking while the Desire messes around. I am sure it has either to do with firmware or, worse, hardware.
I have tried a number of roms, radios and settings and it's the same thing all over.
If nothing works is there a way I can still bring it to warranty service after flashing "unrooted" stock rom if there is one available? I'm so frustrated because I have no idea why this is happening.
Its because three have switched off 2g roaming I have the same problem. Search Google
Sent from my HTC Desire using XDA App
I am on straight talk and a few months ago my phone started automatically trying to switch preferred network mode from GSM/WCDMA (auto or preferred) to LTE/GSM/WCDMA every five minutes on the dot. I assume this is because straight talk now uses the LTE network as well. When my WIFI is off, the phone connects to LTE within a second or two and stops switching the preferred network. At that point, everything is fine, and the phone does what it's supposed to, seamlessly switching between LTE, HSPA+ and 3G depending on what signal is strongest.
Here's where it gets weird. If my wifi is on, then I cannot choose LTE/GSM/WCDMA as my preferred network. The phone however keeps automatically trying to switch to it every five minutes. It switches up from GSM/WCDMA preferred or auto (which are the only two i can manually choose) to LTE/GSM/WCDMA, at which point the phone doesn't get ANY signal, including cellular reception (I know because I've tried calling myself from another phone and it goes straight to voicemail). It stays there for about 30 seconds with no reception before finally giving up and reverting back to GSM/WCDMA. The signal comes back and everything is fine for five minutes, and then it automatically tries to switch up again and i lose service again for another 30 seconds. When I restart my phone, the preferred network always starts out on GSM/WCDMA auto and then starts automatically trying to switch up. It's just that if i have wifi turned off, it connects to LTE and everything's fine and if i have wifi on it does the whole cycle i described no matter what.
The only strange workaround that I've found is that if i wait for it to cycle twice while on wifi, losing reception and then reverting to 'GSM/WCDMA auto' and getting it back, i can then toggle the LTE button in the power menu twice and it stops trying to change preferred network. That only works until the next reboot, and of course means i never have LTE. It's very strange. I've tried different ROMS and different modems and it's always the same except that sometimes a different modem will change the interval between the preferred network automatically trying to change. Also it happens when the wifi is turned on, whether or not i'm actually connected to a wifi signal.
Sorry for the essay, just wanted to be thorough, as i've been searching for a long time and find many similar threads, but nothing quite describing my problem. Any help would be greatly appreciated.
Model: SAMSUNG SGH-1747
Baseband: 1747UCDLK3
Android version: 4.2.2
ROM: MROM 10.1-20131001 -d2att
Kernel :3.4.63 (i think modified, it's whatever comes with this rom)
Straight Talk wireless Unlimited Plan
I've been using my Nexus 7 2013 LTE for almost a year now. But since last week I've been having trouble connecting to the internet via mobile network. I have full signal, but no data connection.
At first the issue was intermittent, but now it's constant. Incidentally, sometime after I started getting problems (but during a brief period of time when I did in fact had a data connection) the device got upgraded to Android 4.4.4. Maybe the upgrade had something to do with the issue, but i'm sure that it started happening before the upgrade.
For some time I was sure that the issue was with the network. After long useless conversations with them I finally tried the sim on another device, and to my disappointment, it worked fine.
I also found out that if i change the preferred network mode to 2G, then i do get a data connection. That's not very useful.
Any thoughts?
I've been having a similar problem since the 4.4.4 update. I work in an LTE coverage area, and live in a 2G area. It transitions just fine from 2G into 3G and LTE, but then when I go back into the 2G area it drops signal entirely. Toggling airplane mode won't make it recover, but a full reboot will. After the reboot it works fine again. I'm considering trying a factory reset to see if that helps.
I just bought a T Mobile LG G3 (D851) for use on AT&T. The guy I bought it from got the unlock code from T Mobile and that is all squared away and unlocked. Things are basically working on AT&T, but data is not working reliably for me. It works fine for awhile, then it just stops working--the 4G/LTE logo in the status bar disappears and I have no connectivity. I can still make phone calls and send/receive SMS texts (though no MMS texts), and if a wifi network is around, that works too. Rebooting does not seem to correct it (though it does start working again eventually).
I don't know if it is just random, but it does seem to happen after I'm leaving somewhere with wifi (and that may not even be relevant--might be that's just when I notice it).
I have verified my APN settings (as well as tried other slightly different settings I've found around the web), but the data network still drops out. Yesterday, I discovered a technique that seems to reliably bring it back on after it has dropped out. If I change the Network Mode to anything else (ex: just GSM), then back out of the network options menu... then go back in and set Network Mode back to LTE (etc). Every time I have tried this, I get the 4G/LTE logo back in the status bar and my connectivity is back.
I know there is some difference in the LTE bands supported by AT&T and the T Mobile LG G3 (D851), but the phone supports band 17, which I'm told is the main LTE band used by AT&T. At this point, I think I'd be satisfied just to have consistent 4G (non-LTE) data.
Any idea what might be the issue? Or anything I can try out? I'm considering flashing a different rom to see if that helps, but wanted to exhaust other options first.
Thanks...
Hello!
I have a big problem with my G4 (H815 version, Germany) beginning with the switch from CM13 to the (stock based) Genisys 3.2 ROM. I've tried to fix it for three days now but without success. It doesn't stick to LTE anymore like it should do and did before. After a reboot it does sometimes connect to LTE but after switching back from wifi or airplane mode it's showing the "no signal" icon. Then it takes some seconds until it reconnects to the mobile network but now just to 2G or 3G. From this point it's not willing to reconnect to LTE, even not through the manual RAT-selection. "Force LTE" using the hidden menu then results in no network connection. However, after restoring my EFS-partition-backup with TWRP (from a time when it was working perfectly) it's connecting to LTE directly after boot but only once and only until you toggle wifi or go offline - like described before. After the next reboot it will mostly connect to 3G and then maybe switch to LTE sometimes or not.
Of course I have checked, deleted and restored my APN multiple times, I have also recovered to a stock V20b and V10d .kdz using LG UP in refurbish mode. Unfortunately even on the fresh and untouched V10d install it shows the same strange behaviour. Restoring the CM13 backup (including EFS partition), which has worked perfectly before, shows the same network bug now.
My sim-card is still working perfectly in my other phones. It still connects and reconnects almost instantly to LTE in my old S4 in places where the G4 did the same but struggles now.
I have even tried the cdmatool which is used to unlock additional LTE bands. I didn't change anything but it does show all usual LTE-bands which are needed for my provider.
Does anyone have an idea what I could try next? I'm living in an area with much better LTE than 3G connection and paying for a quite expensive LTE contract so a working LTE is very important for me. If I don't get that to work again I would need to replace my just over one month old G4 :crying:
Many thanks in advance for your answers
f-rouz
Meanwhile I have also tried another simcard. Still no LTE
i have the exact same problem, well, almost. no unlocked bootloader, but when i first got the phone i root injected the system.img and flashed away, thought everything was fine. now it just doesn't reconnect to 4G. well, at home at least. on my S4 i get 4 out of 5 bars on 4G, with the G4 i get 2 or 3 bars out of 5 on 4G, so the signal isn't great but good enough. i live in hastings (a town) and went to brighton today (a city) where the signal is max 4G, and the device does pick it up. but as soon as i go through a 3G area to home, it doesn't reconnect. have tried flashing original system.img back, upgrading to MM 6.0 after factory reset (via LG bridge), then downgraded again to V10c via LGUP - factory reset before the downgrade, no joy, still the same.
when you say you have forced LTE in hidden menu, did you try this - enter 277634#*# in dialer and go to field test > modem settings > lte band selection and select the band for your operator, which can be found on 'wiki europe lte bands'. there were two bands for my provider (three UK) and band 3 was what i wanted. i can now switch to 4G but it's a pain having to this every time i come home ( i use my phone for home internet via tethering).
worst part is, having refrained from unlocking the bootloader to save the warranty, i phoned LG today to send it back as faulty and explained i could switch it to lte band 3 via the hidden menu and they told me my warranty was now invalid as had OPENED the hidden menu (they told me this after taking my imei). so if anyone reads this and phones LG for a repair, don't tell them you have accessed the hidden menu if you have done what i did.
think i'm just gonna sell the phone, make a palpable loss and buy another one, as i love the phone
Wow, I haven't thought that from LG. I feel like I've searched the whole internet already and nobody has a solution to this problem. I'm about to send my G4 back to Amazon (or sell it otherwise), hope the best and get myself a Oneplus Two because the G4 seems to be too *****y from the development standpoint. I've never had a situation like this with my previous Samsung phones since 2009. I will miss this camera though. And the NFC and the wireless and fast charging capability... the G4 is a nice phone nevertheless...
Edit: And yes, I have tried the "277634#*#" hidden menu, although it isn't accessible through this code on MM any more (you need a terminal command to start this).
Have you tried limiting it to 4G/2G in hidden menu? Mine also have a similar problem in Lollipop in that it is very aggressive in dropping to 3G. That worked for me. Phone doesn't drop to 2G much provided you have decent LTE coverage.
Now I'm on Marshmallow and not rooted, thus cannot do the same. Though it seems to be sticking to LTE a bit better than before.
I have tried that but it doesn't work. As I don't get any network connection wenn forcing LTE only, forcing LTE/2g results in 2g only.
My G4 still doesn't want to connect to LTE so I have ordered a S6 now... As I still have no idea what was causing this I just can't risk that happening again. It has been a short journey for my first LG and me and I really liked my G4 actually... Bye G4 community
you just needed to flash the stock modem, most likely
Unfortunately, it isn't that easy. That was of course the first thing I did (and not just one time)...