Just last night my EVO 4G running Energy ROM version 1.10.2012 suddenly stopped receiving 3G service. There is usually a 3G icon, but it's gone. Can't enable GreenK45 or anything. I've done two manual reboot (battery pulls) and even changed the PRL. Very frustrated as nothing I've tried has worked. It will still make and receive calls but states there is no data connection when doing anything involving connecting to the internet.
Any ideas?
Your carrier might be roaming on another carrier who uses a different frequency. EG. AT&T uses 850/1900, T-Mobile 1700/2100. Most phones will only support 1 set of 3g bands.
So I don't know if it was something with the ROM as a power saving feature but it had unchecked the "Mobile network" connection box. I definitely didn't uncheck it, and it was the last thing I looked at before about giving up to reflash the phone.
So is the issue resolved?
Sent From Space Using My ICS Flavored Sensation
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AT&T customer service told me today that the HSPA+ network is capable of simultaneous voice and data, but that the LTE network is not (yet). She said that if you receive a call while using data, the phone will drop back to HSPA+. She also said that it may take awhile before the Skyrocket goes back into LTE mode. So she told me to put my phone is Airplane Mode for 15 seconds and that this would reconnect me to LTE if it's available.
Can anyone confirm this? I don't have my Skyrocket yet.
i have not seen my phone ever not have the lte signal up top. unless i get NO signal when im at my job. which normal for me.
and thats after calls as well.
i can confirm that LTE is NOT capable of doing voice AND data at the same time. So yes your phone will switch back to "4g" (or slower) during all phone calls. I don't know how long it'll take to switch back.
My phone used to'do this..after the 2.3.6 update it stop
Sent from my SAMSUNG-SGH-I727 using XDA App
This is correct. We were testing it over the weekend.
We even tried using Google voice to make the call and override the switch but the phone apk itself appears to initiate the switch from lte to hspa. This is not new info...it has been speculated that this would be the case.
I see some report the update changed this so I will test that tomorrow.
In testing the phone immediately switched back to lte after the call. The consensus seems to be that if your phone does not switch back you need either the new sim, reprovisioning on Matt's end or both. This seems to fix data connectivity issues and network type swapping issues that many are having
Sent from my SGH-T989 using XDA App
I've been happily using an HTC MT4G Slide/Doubleshot I got on Ebay since December (I'm in Canada, using it with Wind Mobile, AWG 3G bands). Last Sunday my phone suddenly started showing "No Signal" for the cellular connection (wifi still works just fine), even though I had full signal bars, and I was unable to complete calls, even the *611 carrier service calls. With the Wifi turned off, I noticed I was still receiving emails, oddly enough, even though I could not register on my network. My SIM was working fine in other phones, and a SIM from another carrier (GSM 2G only) worked just fine. I tried a new SIM from my carrier, no luck, same thing.
I know AWS splits its up/downlinks between the 2 sets of bands it uses (1700MHz for up, 2100MHz for down), so I'm guessing something strange happened to selectively knock out the up bands only. But what? My phone is on EmmanuelU's KitKatDS 1.3, but the only unusual thing I could think of software wise was that I had recently updated Xposed framework to the latest version. I though maybe that did something weird to the baseband firmware, so I restored the original stock Gingerbread ROM via ClockworkMod - no change. I applied the available OTA updates from T-Mo - nothing. Re-flashed KitKatDS & restored by current set-up - nothing.
I'm completely stumped and seriously starting to worry it's some freak hardware thing. Anyone here ever experience something like this?
Thanks for any of your thoughts!
Never seen this myself before, check your apns would be my next step. Maybe try *#*#4636#*#* from the dialer and see if what it says there too. But mostly I'm stumped
Sent from my Nexus 4 using XDA Premium 4 mobile app
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.
EDIT: Turns out it does work, but only for a few minutes until it disconnections. Data confirmed to work during this time period, same as text.
Ok so I've tried searching around with no hope.
I have a One S T-Mobile phone, and using it with both stock and CM, the 3G does not work.
It a few times it would connect and then jump off. It doesn't seem to even recognize the existence of 3G now. On the network selector on the quick settings panel in CM, it only lets me select 2G... setting it back to 3G prefered doesn't help at all.
I'm on WIND mobile, which the 3G uses AWS 1700/2100, which is clearly supported by this phone if you look on GSM Arena (it's the tmobile version for sure, it's pasted across the front of the phone and throughout the stock rom)
Not to mention, I'm told most, if not all, T-Mobile phones work with WIND. Is the 3G radio broken perhaps? Is there a way I can check this?
Anyone have any clue?
Jem256 said:
Ok so I've tried searching around with no hope.
I have a One S T-Mobile phone, and using it with both stock and CM, the 3G does not work.
It a few times it would connect and then jump off. It doesn't seem to even recognize the existence of 3G now. On the network selector on the quick settings panel in CM, it only lets me select 2G... setting it back to 3G prefered doesn't help at all.
I'm on WIND mobile, which the 3G uses AWS 1700/2100, which is clearly supported by this phone if you look on GSM Arena (it's the tmobile version for sure, it's pasted across the front of the phone and throughout the stock rom)
Not to mention, I'm told most, if not all, T-Mobile phones work with WIND. Is the 3G radio broken perhaps? Is there a way I can check this?
Anyone have any clue?
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Ok, so apparently it does connect, but only for 2 or 3 minutes before disconnecting. The data works fine, the service works fine, but it just bails on the connection after a few minutes until i restart the phone.
Jem256 said:
Ok, so apparently it does connect, but only for 2 or 3 minutes before disconnecting. The data works fine, the service works fine, but it just bails on the connection after a few minutes until i restart the phone.
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http://forum.gsmhosting.com/vbb/f485/htc-one-s-stuck-2g-network-plz-help-1880307/
I've read a few others with this issue. Randomly the phone will seemingly loose connection will not recieve calls or texts until you pick it up and use it. And 50 texts start coming thru. Etc... I'm on T Mobil, have great signal. I've toggled 3g preferred, 4g preferred, and have developer options enabled, keep connection at all times. Still does it. Any thoughts???? Or help would be appreciated
DrmMaster said:
I've read a few others with this issue. Randomly the phone will seemingly loose connection will not recieve calls or texts until you pick it up and use it. And 50 texts start coming thru. Etc... I'm on T Mobil, have great signal. I've toggled 3g preferred, 4g preferred, and have developer options enabled, keep connection at all times. Still does it. Any thoughts???? Or help would be appreciated
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Click to collapse
Same problem at this post> https://forum.xda-developers.com/nex/help/vivo-nex-powering-off-t3831114/post77375427#post77375427
Go to Settings> More Settings > Task Timer> Scheduled On/Off
Saloei said:
Same problem at this post> https://forum.xda-developers.com/nex/help/vivo-nex-powering-off-t3831114/post77375427#post77375427
Go to Settings> More Settings > Task Timer> Scheduled On/Off
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Click to collapse
Thanks but this isn't my issue. Phone seems to struggle switching bands. From 4g to 3g and gets hung.
This phone connects to T-mobile 4g fine for data. But for sms and calls it goes to 3g, as it doesn't have VoLTE...seems like it doesn't switch all the time or get hung up. I've tried turning off 4g. This seems to help. But the phone has a definite issue. Not sure if it's considered normal since it's not utilizing 4g for voice and one of the little things you have to live with
DrmMaster said:
Thanks but this isn't my issue. Phone seems to struggle switching bands. From 4g to 3g and gets hung.
This phone connects to T-mobile 4g fine for data. But for sms and calls it goes to 3g, as it doesn't have VoLTE...seems like it doesn't switch all the time or get hung up. I've tried turning off 4g. This seems to help. But the phone has a definite issue. Not sure if it's considered normal since it's not utilizing 4g for voice and one of the little things you have to live with
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There's definitely an issue, and it's not just with the Tmobile sim. Sometimes my china unicom Sim says no service too. But they won't say no service at the same time. It's one or the other. I've tried to switch the sims to other slots but same thing. I know its an issue with the phone because when my phone says no service, i look at my wifes phone and she has full bars on her phone. (pixel 2 xL in china with Tmobile USA Sim roaming on china mobile)
Must be a software issue
I have an similar issue... Just it's only for my 3G/4G after 10min of utilization i lost connection (call & sms work fine) and my phone say all is ok (I have the 4G icon...) I forced to disable / enable the Data 1 or 2 times for 3G/4G come back... I have Global Rom & SFR french network
Same problem 10 min data off for like 45 seconds n comes back by itself
Hmm similar problem. Having trouble getting calls on Tmobile. Lots of people calling and going straight to voicemail.