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[Q] Stuck on 3G network!

My Verizon Galaxy SIII is stuck on 3G, and will not access 4G. I am using Cyanogenmod 10.2.1 (stable).
The problem started when I was travelling, and used *228 to try and improve reception. I just meant to use option 2 to update the list of towers (Preferred Roaming list), but derped and pressed 1 instead. Option 2 just updates the list of towers, while option 1 also updates the location of my Home switch. No issues making receiving calls/texts etc, but stuck on 3G data speeds.
Once I returned home from my trip, I used *228 option 1 again to fix this, but it did not.

allstrox said:
My Verizon Galaxy SIII is stuck on 3G, and will not access 4G. I am using Cyanogenmod 10.2.1 (stable).
The problem started when I was travelling, and used *228 to try and improve reception. I just meant to use option 2 to update the list of towers (Preferred Roaming list), but derped and pressed 1 instead. Option 2 just updates the list of towers, while option 1 also updates the location of my Home switch. No issues making receiving calls/texts etc, but stuck on 3G data speeds.
Once I returned home from my trip, I used *228 option 1 again to fix this, but it did not.
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I had the same issue for the longest time... and did everything you tried... I ended up giving up and going into the Verizon store and asking for a new Sim Card (Which is free of charge). After that BOOM 4G again! everywhere!!! I recommend going in and getting a new SIM card!

Badouken said:
I had the same issue for the longest time... and did everything you tried... I ended up giving up and going into the Verizon store and asking for a new Sim Card (Which is free of charge). After that BOOM 4G again! everywhere!!! I recommend going in and getting a new SIM card!
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Thanks! Might have to do that if nothing else works. Can't let them see I have a custom ROM on my phone.

allstrox said:
Thanks! Might have to do that if nothing else works. Can't let them see I have a custom ROM on my phone.
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Ya No Problem....funny thing was the employee there couldn't tell I had a custom rom on my phone... regardless of him being unable to find anything on my phone lol, If worse came to worse I was just going to play dumb and say my friend "did something" to my phone to make it look different.

Loss of 4G?

I've been trying to troubleshoot this problem for the past 3 days or so. In a nutshell, I'm on AllainceRom (which I have been since released) and get constant 4G signal. Wake up, head to work and notice no signal at all. I check and my mobile data was shut off, so connected it. It gets a connection...3G. Turn on/off airplane mode and still 3G. Borrow friends sim card, boot it up and it's 4G. Figuring it's the sim card, I buy a new one. Call Verizon to activate it, BAMM 4G is back. Within 2 minutes after the phone call, it loses signal, then kicks back on, 3G again. I would hit airplane mode on/off and 4G would pop out and all of a sudden it would go back to showing nothing,then revert to 3G again. Any ideas of what can cause this? I'm baffled. I even downloaded the MF1 versus ML1 and it still shows 3G. My download speeds, a blazing 2 megs. Almost feel like I've been throttled or something for some reason.

Has your phone been working fine before and this just started happening over the past few days? Also do you only lose 4G in certain areas?
I know that it is recommended to flash the ML1 modem on any 4.3 based ROM because of potential 4G issues.

This might sound odd, but I think somehow they are throttling me. I'm on the grandfathered unlimited plan. What's odd is that I can take an old sim card (from Thunderbolt), basically cut it to the same size as my S3, reboot and 4G is constant (this phone is part of my dummy line so limited to 2gigs per month). Take out that card, put in new one, it boots up and has like 4 bars while searching for signal, then drops to like 3 and connects to 3G again constant.
4G has been constant here for the past 2 years, Verizon tech support confirmed no outages. My wife and son have unlimited as well, but iphone 4's with 3G coverage. Thinking my unlimited 4G is getting knocked down for some reason.
I tried a new rom, Clean Rom and same results with signal quality. Just odd it happening all of a sudden with no changes.
Also, with my thunderbolt 4G sim card, mobile network type was listed as LTE. With the brand new sim card they activated, it's showing "CDMA -eHRPD", as it was showing with my old card.
BattsNotIncld said:
Has your phone been working fine before and this just started happening over the past few days? Also do you only lose 4G in certain areas?
I know that it is recommended to flash the ML1 modem on any 4.3 based ROM because of potential 4G issues.
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snafufx said:
This might sound odd, but I think somehow they are throttling me. I'm on the grandfathered unlimited plan. What's odd is that I can take an old sim card (from Thunderbolt), basically cut it to the same size as my S3, reboot and 4G is constant (this phone is part of my dummy line so limited to 2gigs per month). Take out that card, put in new one, it boots up and has like 4 bars while searching for signal, then drops to like 3 and connects to 3G again constant.
4G has been constant here for the past 2 years, Verizon tech support confirmed no outages. My wife and son have unlimited as well, but iphone 4's with 3G coverage. Thinking my unlimited 4G is getting knocked down for some reason.
I tried a new rom, Clean Rom and same results with signal quality. Just odd it happening all of a sudden with no changes.
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I doubt you are getting throttled. Unless you are using up 100+ GB a month constantly. If that was the case you can call tech support and ask if you are. I'm pretty sure they would have to tell you if they were.
Was there something specific you did to your phone before this started happening? Have you tried different ROMs or re-flashing Alliance?
If you've exhausted all options I think something is borked and you need to reprovision. To do this you would need to ODIN to a stock 4.1.2 base and enter the reprovision code into the dialer (*2767*3855#). This will wipe your internal data so I would back up anything you need first. Once you do that you can re-root and flash a custom recovery then flash back to whatever you want.
Just make sure you don't take the 4.3 OTA if you return to stock unless you want to re-lock your bootloader.

That's the odd thing, nothing was changed prior to this switching to 3G, like it happened all of a sudden. I checked my usage and I'm at 19 gigs this month (yeah I tether a lot).
I tried beanstalk rom (4.4.2) and something odd happened. In preferred network type, under CDMA+LTE/EVDO I would get 3G. If I switch it to LTE/GSM/WCDMA 4G would pop up, but no mobile data so unable to make phone calls. With this rom, I would insert my old thunderbolt sim card and 4G all day long again with no issues.
I guess the only option would be to revert to stock and start all over in hopes it'll switch back. I was hoping it was just the icons jacked up, but at 3G my d/l speed was 2 megs, at 4G it would hit 12-14 megs.
BattsNotIncld said:
I doubt you are getting throttled. Unless you are using up 100+ GB a month constantly. If that was the case you can call tech support and ask if you are. I'm pretty sure they would have to tell you if they were.
Was there something specific you did to your phone before this started happening? Have you tried different ROMs or re-flashing Alliance?
If you've exhausted all options I think something is borked and you need to reprovision. To do this you would need to ODIN to a stock 4.1.2 base and enter the reprovision code into the dialer (*2767*3855#). This will wipe your internal data so I would back up anything you need first. Once you do that you can re-root and flash a custom recovery then flash back to whatever you want.
Just make sure you don't take the 4.3 OTA if you return to stock unless you want to re-lock your bootloader.
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If other SIM cards are working correctly, it can't be anything wrong with the phone. I would either go to Verizon and keep asking for new SIM cards until you get one that works, or try to reprovision like I explained earlier.

Thanks for the suggestions, I'm rocking stock 4.0.4. now and still only have 3G service. Guess I'll just keep it like this and hit up the Verizon store and have them figure it out since it's stocked back out.
BattsNotIncld said:
If other SIM cards are working correctly, it can't be anything wrong with the phone. I would either go to Verizon and keep asking for new SIM cards until you get one that works, or try to reprovision like I explained earlier.
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I was experiencing similar issues as you this morning. After an hour of the nice lady at tier 1 tech support telling me to erase everything on my phone and that it was probably bc I was talking to her on the phone while trying to fix it I reached a resolution upon calling back. I was sent to a higher tier tech support and they told me that my data was being throttled and it was directly related to my high data usage.
Confused I asked her how that was possible bc they aren't suppose to throttle LTE. She said there is a problem with their system and instead of only throttling 3G, it was now throttling LTE data. She explained this is a nationwide issue and that some people she has talked to have been experiencing trouble with this issue since March 23rd!!
Similar to you I tried another phone, my nexus galaxy only to experience the same problem. The only thing that worked for me was switching my network mode from LTE/CDMA to Global. I could then tether Netflix and use the data connection without being impeded. However, certain functions like my email (gmail and yahoo) and verizon cloud services would say network error or network communication error.
Strangely tonight my phone seems to be back in working order, I'm not sure if its just because there is no network congestion so I'm not being throttled and it will return or if the issue has been actually fixed.
Now that I think about it, it's possible the tech was wrong and it's a CDMA to lte handshake issue they are having which would explain why global mode would work? It maybe that they upgraded the towers to lte advanced in my area causing these types of issues but hard to confirm any of this with verizon being so tight lipped about what areas have lte advanced.

Replied to your post, I'll update once I get back from Verizon.
Samutd45 said:
I was experiencing similar issues as you this morning. After an hour of the nice lady at tier 1 tech support telling me to erase everything on my phone and that it was probably bc I was talking to her on the phone while trying to fix it I reached a resolution upon calling back. I was sent to a higher tier tech support and they told me that my data was being throttled and it was directly related to my high data usage.
Confused I asked her how that was possible bc they aren't suppose to throttle LTE. She said there is a problem with their system and instead of only throttling 3G, it was now throttling LTE data. She explained this is a nationwide issue and that some people she has talked to have been experiencing trouble with this issue since March 23rd!!
Similar to you I tried another phone, my nexus galaxy only to experience the same problem. The only thing that worked for me was switching my network mode from LTE/CDMA to Global. I could then tether Netflix and use the data connection without being impeded. However, certain functions like my email (gmail and yahoo) and verizon cloud services would say network error or network communication error.
Strangely tonight my phone seems to be back in working order, I'm not sure if its just because there is no network congestion so I'm not being throttled and it will return or if the issue has been actually fixed.
Now that I think about it, it's possible the tech was wrong and it's a CDMA to lte handshake issue they are having which would explain why global mode would work? It maybe that they upgraded the towers to lte advanced in my area causing these types of issues but hard to confirm any of this with verizon being so tight lipped about what areas have lte advanced.
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[Q] 4g data drops often...too often

i have to reboot in order for the 4g data to work again but it only stays on for about a minute and then it stops working again. everything else on the phone works ( text, voice, wifi etc...) I read somewhere that flashing different radios might fix it but im not sure about that. anyone else experience this and have a work around? i am currently on baseband i535VRLG1
Thanks In advance
i called Verizon and they said it may be the sim card thats damaged. if that were the case wouldnt voice and text fail as well?

frunas80 said:
i have to reboot in order for the 4g data to work again but it only stays on for about a minute and then it stops working again. everything else on the phone works ( text, voice, wifi etc...) I read somewhere that flashing different radios might fix it but im not sure about that. anyone else experience this and have a work around? i am currently on baseband i535VRLG1
Thanks In advance
i called Verizon and they said it may be the sim card thats damaged. if that were the case wouldnt voice and text fail as well?
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I'm having the same issues recently. I've always gotten a 4G signal at my house (albeit not the strongest one) but lately, my phone will not hold on to the connection. When coming off of wifi, my phone will not acquire a data connection at all most of the time. I can still send/receive texts and calls but there is no 4G or 3G icon, no MMS, and no data. I have to toggle the radios on/off, or change from CDMA/LTE to Global (or GSM) and back, put in airplane mode, or restart.....there is no guarantee any one of those steps will work. Sometimes I have to do it repeatedly until I get my data connection back but it is only temporary.
I'm on the i535VRBMF1 baseband and updated to the ML1 modem to try and resolve but to no avail. I have replaced my sim card (as I initially though that was the issue) but it has not helped either.
The only thing I can think of is that my PRL may have been updated (it is currently 15310) and it's causing issues with the towers in my area.
I just got back from Hawaii and was also in San Diego for a few days and had absolutely no issues. It seems to only be an issue now when I'm at my house which makes me think it is something VZW network related and nothing to do with my phone per say. It's really driving me nuts though.
BTW, I'm in Southern California (Irvine).

I seemed to have fixed the issue by reverting the baseband back to vrlf2. I had to switch from global to 4g/LTE because I vegan to inch roaming charges lol. Verizon credited me and no dropped 4g signal. So I'm happy.

frunas80 said:
I seemed to have fixed the issue by reverting the baseband back to vrlf2. I had to switch from global to 4g/LTE because I vegan to inch roaming charges lol. Verizon credited me and no dropped 4g signal. So I'm happy.
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What ROM are you running? I'm just curious what the implications are of running an older baseband (from the ICS days) on a newer ROM/Kernel.

I'm running cleanrom8.1 core edition. Slightly buggy but tolerable.

I was finally able to somewhat resolve my issue so I thought I'd post in case anyone else is experiencing something similar.
By using a few different apps and testing techniques, I was finally able to deduce that my issue had to do with EHRDP hand-off with the towers in the immediate vinicity to my house. I'm not sure what VZW did to them lately but it doesn't appear to be a problem in other locations so it seems like the issue is on their end (and not something to do with my phone).
In any case, it seems that when my 4G connection is weak and EHRDP is detected, it is dropping the connection entirely instead of handing if off to 3G (EVDO). The connection is also never transferred back when a 4G signal is detected either until I reset the connection where there is a moderate 4G signal.
Again, this only seems to be an issue when connected to the towers near my house and doesn't occur when traveling abroad.
To fix this, I have disabled EHRDP by doing the following:
1) Open the dialer and type *#97328640#
2) Select "[2] CDMA"
3) Select "[2] Data"
4) Select "[7] eHRPD e/disable"
5) Select "[2] Disable(*)"
6) Reboot the phone
Now my phone switches between EVDO revA. for 3G (using the native protocols) and LTE rather than relying on the broken eHRDP protocols. This workaround will have to suffice until VZW fixes stuff in my area but at least I don't miss MMS messages anymore.
Hope this helps anyone running into similar situations.

[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.
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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.

[Q] Signal drop Official CM12

Using Ting (MVNO using Sprint network CDMA) ever since I upgraded from CM11 to CM12 I get intermittent loss of cell signal at times. Every couple of minutes, regardless of where I am or how strong my signal is I will lose all cellular signal for about 20 seconds, including voice and data, and then it will pop back up just like it was before.
I've tried downgrading to two different radios and nothing seems to make any difference. Like I said before this problem didn't occur until I did a clean flash of CM12.. everything was fine with CM11.
I've even wiped/reinstalled CM12 with the same issues.
Does anyone have a solution for this yet?

I recommend keeping your radios updated to LRX22C. Where did you get your ROM from?
Sent from my Nexus 5 using XDA Free mobile app

Direct from cyanogenmod

From what I've gathered, it seems that sprint networks being unreliable on cm12 has been an existing problem that may get fixed in the future.
Sent from my Nexus 5 using XDA Free mobile app

Well I fixed it.. sort of. I had tried this before but I didn't reboot the phone.
SETTINGS / MOBILE NETWORK SETTINGS/ PREFERRED NETWORK TYPE
I switched it from LTE to 3G. Looks like I might not be getting LTE coverage but it's hard to tell as LTE is sketchy at best at home and at work... and in either case I'm on Wi-fi anyway. Not a huge deal.
I had tried this before but I didn't reboot the phone after making the change. As long as I leave it on 3G my cell signal never drops. If I switch it to LTE or GLOBAL then it will randomly drop as described above.
I'll retest things after each CM12 update I install see if we get one that works!

MasterTec said:
Well I fixed it.. sort of. I had tried this before but I didn't reboot the phone.
SETTINGS / MOBILE NETWORK SETTINGS/ PREFERRED NETWORK TYPE
I switched it from LTE to 3G. Looks like I might not be getting LTE coverage but it's hard to tell as LTE is sketchy at best at home and at work... and in either case I'm on Wi-fi anyway. Not a huge deal.
I had tried this before but I didn't reboot the phone after making the change. As long as I leave it on 3G my cell signal never drops. If I switch it to LTE or GLOBAL then it will randomly drop as described above.
I'll retest things after each CM12 update I install see if we get one that works!
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Were you able to find a solution for this that you could share?

Honestly no..I just keep it on 3G and there are no issues.
I tried about a week ago switching back to LTE but the display never showed LTE and I definitely wasn't getting LTE speeds and the signal drop returned.
TBH LTE coverage is pretty spotty in my area and I don't use a lot of data outside of Wi-Fi anyway so it's pretty much a non issue for me.
When a CM12 snapshot is released I'll probably try again.
I should add that I dirty flash the latest nightly almost every morning. When a snapshot comes out I'll wipe and clean flash things and go from there.

Update... about a month ago I did a full wipe, going back to stock, did the network updates, etc and all was well.
Then I did a fresh install of cm12.1 and every thing worked great.. Lte and all!
A couple days later I dirty flashed a nightly and got an exclamation point and no data (Wi-Fi is fine). I did find the sprint fix flash which allows me to do the network updates again from cm (had to switch to 1X for it to work) but that only yielded a temporary fix.
I did however find a workaround. If I go to my apn settings menu and change a setting on my ting (sprint mvno I use) entry then change it back and save then BINGO! I have Lte again...
That is... Until I get handed off to another tower.. Then I have to do the workaround again.