Database Info

[Q] No cell data while on phone call

Hello all,
Ive noticed recently that I lose my data connection on my Sensation 4G (4g, 3g, or edge) whenever I am on a phone call. It comes back immediately after I hang up, but I can't use any data while on the call. Its really strange as Ive never had this issue on any of my previous TMobile phones (G2x, Vibrant, G1). Anyone else have the same issue and has anyone found a fix\workaround? Its quite annoying when ur trying to look up something in Google Maps while on a call and theres no data
Ive double-checked WCDMA\GSM Auto is enabled in wireless settings btw., and it switched between Edge, 3g adn 4g without issue. Seems limited to being on a phone call.

want to know this answer as well

zimphishmonger said:
Hello all,
Ive noticed recently that I lose my data connection on my Sensation 4G (4g, 3g, or edge) whenever I am on a phone call. It comes back immediately after I hang up, but I can't use any data while on the call. Its really strange as Ive never had this issue on any of my previous TMobile phones (G2x, Vibrant, G1). Anyone else have the same issue and has anyone found a fix\workaround? Its quite annoying when ur trying to look up something in Google Maps while on a call and theres no data
Ive double-checked WCDMA\GSM Auto is enabled in wireless settings btw., and it switched between Edge, 3g adn 4g without issue. Seems limited to being on a phone call.
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It's based on the Carrier that u r using..This is not an issue of the Phone.
I'm on Vodafone India with same issue..I can't get data connection while Call, But when I switched the Carrier it works again...
So in short this is depended on the Carrier that u r using..Some carriers support this dual task(call+data) and some dont...
emerica243 said:
want to know this answer as well
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Sent from hunt's Sensation

Disable LTE without custom ROM?

I have the ATT HOX and want to disable LTE due to the known issues with missed calls etc. Would it be possible to disable it through root access WITHOUT installing a custom ROM?

I'm not sure what AT&T do to their phones but can you not change it via Settings > Mobile Network > Network mode.
Sent from my HTC One XL using xda premium

thejosh86 said:
I'm not sure what AT&T do to their phones but can you not change it via Settings > Mobile Network > Network mode.
Sent from my HTC One XL using xda premium
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That's how it's done on my Rogers device.. should be the same on all.

this_is_nick6 said:
That's how it's done on my Rogers device.. should be the same on all.
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Click to collapse
Same on Telstra
Phone: HTC One XL
ROM: AOKP 4.2.1 MR1 preview w/ alloy blue theme
Launcher: Apex w/glaskart icons

Att one x doesn't have that function. Try to do it in service menu trying typing in *#*#4636#*#*
Go to phone info and scroll down. It works for me on clean Rom but not sure about stock rom

a670 said:
I have the ATT HOX and want to disable LTE due to the known issues with missed calls etc. Would it be possible to disable it through root access WITHOUT installing a custom ROM?
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Click to collapse
What known missed calls issue? What would LTE have to do with missed calls? LTE on AT&T is data only. It doesn't do anything with calls. You can dial *#*#4636#*#* and try to set it to gsm only or something.
Sent from my One X using Tapatalk 2

Believe me I have tried. It's not possible. But ik you said you didn't want to, but you really should look into custom ROMs. There's some that are basically stock with just better battery

Except for ATT. Its a well documented fact that they have it disabled. Any changes you make revert back to default.
this_is_nick6 said:
That's how it's done on my Rogers device.. should be the same on all.
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Click to collapse

Its a fairly well known issue with ATT and LTE phones.
As far as I can tell since LTE IS data only it has a hard time receiving calls when its connected to the LTE network. I think it has something to do with only having 1 antenna and it cant communicate on voice and data at the same time. Or, maybe not.:silly: All I know is that when my phone is connected to LTE I will not receive phone calls. All calls will ring a few times and then go to voice mail. I eventually get voice message notifications when the phone switches out of LTE.
Any changes made in the field test mode do not stick. Thank you very much ATT.
pside15 said:
What known missed calls issue? What would LTE have to do with missed calls? LTE on AT&T is data only. It doesn't do anything with calls. You can dial *#*#4636#*#* and try to set it to gsm only or something.
Sent from my One X using Tapatalk 2
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Click to collapse

a670 said:
Its a fairly well known issue with ATT and LTE phones.
As far as I can tell since LTE IS data only it has a hard time receiving calls when its connected to the LTE network. I think it has something to do with only having 1 antenna and it cant communicate on voice and data at the same time. Or, maybe not.:silly: All I know is that when my phone is connected to LTE I will not receive phone calls. All calls will ring a few times and then go to voice mail. I eventually get voice message notifications when the phone switches out of LTE.
Any changes made in the field test mode do not stick.
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I've had 3 different LTE phones on AT&T and never had issues with missed calls and I'm constantly on a LTE connection. My phone kicks to hspa+ right before I receive a call and then it rings. Goes back to LTE about 30 seconds after I hang up. The only thing I can think of is that you are on LTE only in the field test mode thing. That will definitely give you call problems. What does it say that you are connected to when you go into the phone information menu?
Sent from my One X using Tapatalk 2

pside15 said:
I've had 3 different LTE phones on AT&T and never had issues with missed calls and I'm constantly on a LTE connection. My phone kicks to hspa+ right before I receive a call and then it rings. Goes back to LTE about 30 seconds after I hang up. The only thing I can think of is that you are on LTE only in the field test mode thing. That will definitely give you call problems. What does it say that you are connected to when you go into the phone information menu?
Sent from my One X using Tapatalk 2
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I've had a few LTE phones too but I can confirm that this is an issue with AT&T and the HOX. (At least in certain areas.) The phone is *supposed* to do what you said and switch off LTE when a call comes in but that doesn't always happen. I've noticed it the most at my office where I usually have 4 bars of "4G LTE" or one or two bars of "4G". I'll have a long period of time with no incoming calls or texts and then when I make a call (and the phone switches to "4G") I get the backlog of voicemails and text messages. Hard resets haven't helped and AT&T refuses to admit that it's a problem.

Heres a summary of what I have found:
1 Being in field test mode does not affect incoming calls.
2. When making outgoing phone calls with LTE or HSPA displayed in field test mode, the connection will switch to UMTS and then revert back to LTE or HSPA after hanging up. I dont know what that means, just throwing it out there.
3. On a few occasions during my testing I have noticed that I could not receive calls when HSPA is displayed in field test mode. I think that the phone had just switched from LTE, although I havent been able to 100% verify that.
4. My connection at my house varies between LTE, HSPA,EDGE.
5. EDGE is great. My phone makes and receives calls all day long when I have a EDGE connection.
6. Most of my testing has been at home where I have crappy reception to begin with. On a few occasions when I had my wife with me I had her call my phone(connected to LTE). Same as when at home, my pone never rings.
pside15;36112809]I've had 3 different LTE phones on AT&T and never had issues with missed calls and I'm constantly on a LTE connection. My phone kicks to hspa+ right before I receive a call and then it rings. Goes back to LTE about 30 seconds after I hang up. The only thing I can think of is that you are on LTE only in the field test mode thing. That will definitely give you call problems. What does it say that you are connected to when you go into the phone information menu?
Sent from my One X using Tapatalk 2[/QUOTE]

ITNV said:
I've had a few LTE phones too but I can confirm that this is an issue with AT&T and the HOX. (At least in certain areas.) The phone is *supposed* to do what you said and switch off LTE when a call comes in but that doesn't always happen......".
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Exactly!

I have Samsung Galaxy S3 on AT&T and I have same issue when connected to LTE. I have been working with AT&T CSR for over a week and no resolution yet. I have talked them into switching my data plan from 300MB LTE to Unlimited Standard Phone data plan. (Unlimited standard phone data plan uses HSPA+ and not LTE, which would resolve the issue)
From what I have understood so far, its not the phone, its the AT&T LTE network.

Wouldnt people with the same phone have more answers for you?
Sent from my HTC One XL

Who are you talking to
954wrecker said:
Wouldnt people with the same phone have more answers for you?
Sent from my HTC One XL
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AlwaysNoob said:
I have Samsung Galaxy S3 on AT&T and I have same issue when connected to LTE. I have been working with AT&T CSR for over a week and no resolution yet. I have talked them into switching my data plan from 300MB LTE to Unlimited Standard Phone data plan. (Unlimited standard phone data plan uses HSPA+ and not LTE, which would resolve the issue)
From what I have understood so far, its not the phone, its the AT&T LTE network.
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I didnt even know that kind of plan existed. Have you switched over yet? Does it work?:fingers-crossed:

a670 said:
I have the ATT HOX and want to disable LTE due to the known issues with missed calls etc. Would it be possible to disable it through root access WITHOUT installing a custom ROM?
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Click to collapse
Have you tried this? http://forum.xda-developers.com/showpost.php?p=27732183&postcount=8

954wrecker said:
Wouldnt people with the same phone have more answers for you?
Sent from my HTC One XL
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Click to collapse
No, because this issue is not related to the phone but its related to AT&T LTE network. So everyone on AT&T LTE network has same issue and not only people with HTC one X.
---------- Post added at 03:20 PM ---------- Previous post was at 03:17 PM ----------
a670 said:
I didnt even know that kind of plan existed. Have you switched over yet? Does it work?:fingers-crossed:
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I was on phone with them last night. They have created a case number for me so their "technical team" can look into it. They promised me to get back to me before friday on this.
For changing the data plan, the CSR tried to change it but it didnt work yesterday. I blame it on the CSR because I know some people on XDA has done that before. I am gonna call them again and have a different CSR try it or me.
And plus, with this change, you get unlimited HSPA+ for just $10.

cr1960 said:
Have you tried this? http://forum.xda-developers.com/showpost.php?p=27732183&postcount=8
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Thanks for the link. Those settings actually worked for me. I had already tried a couple different APN configs but none of them seemed to stick.
So, now I have successfully disabled LTE.
Unfortunately, I'm still having intermittent missed calls with the phone connected to HSPA. Also, At work in certain areas, we have rock solid LTE reception and guess what...no missed calls. WTFrack?
At home the only time I can get regular calls is when the phone is connected to EDGE.
I seriously think that there must some relationship between 4G/LTE and signal strength. Does anyone know If EDGE and 4G/LTE use the same towers or same power outputs?

Dropped calls when going from lte to hspa/hspa+

Just recently I've noticed that I drop calls when I'm on a LTE signal. It is very annoying. Is anyone else having this problem. Does anybody have any idea what is going on here. I notice if I have a HSPA/HSPA+ signal I don't drop calls.
Actually I noticed if I turn LTE off I don't drop calls at all. I am on the AT&T network if that matters.

tdamocles said:
Just recently I've noticed that I drop calls when there is a week LTE signal. It is very annoying. Is anyone else having this problem. Does anybody have any idea what is going on here. I notice if I have a strong HSPA plus signal I don't drop calls.
Actually I noticed if I turn LTE off I don't drop calls at all. I am on the AT&T network if that matters.
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Same network, similar but different issue. Within the last couple of days my phone now hangs up the call after a few seconds. Sitting at my desk, signal strength is in the -70's, a call comes in and the LTE symbol drops to HSPA or HSPA+, (good so far) then no icon shows then the signal indicator goes completely blank, the call hangs up then after a brief pause the phone reconnects to LTE. I'm completely stock, running the latest CM 11S and I've tried everything I can think of to figure out the problem. I've wiped the phone, stopped using Google Voice, I have not added new apps lately, swapped out my SIM card into my OPPO Find 7A and it works flawlessly...I'm at a loss. At this point pre-ordering the N6 can't come soon enough for me.

That is actually what happens to me but I couldn't explain it as well. I'm on a cm11 rom.
I'm wondering if it has something to do with AT&T.

Have you updated to 38r?

tdamocles said:
Have you updated to 38r?
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Yup, updated as soon as it came out so it's been a few week now for me. Had the phone since early June, this has been my real first issue I can't overcome....pissed

Have you tried to turn off lte and just run it on 3g?

tdamocles said:
Have you tried to turn off l t e n just run it on 3_g?
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No and at this point I kind of don't care since I'm getting the N6 as soon as it launches. I can make due with my Find 7A for a few more weeks. In some regards it's actually better as a phone than my OPO. Probably going up on Swappa soon!

I was just wondering if yours is acting the same way with the lte deactivated.

Yep had this since i got the phone, sometimes on lte it just wont let me call and say " mobile network unavailable ", been on 3g for a long time and haven't had any problems.
probably because lte coverage where i live is meh.

Yeah but WTF, this is bull**** to have an LTE phone and force it on 3G. I'll put the SIM card back in and try on 3G for a bit but if I get frustrated and throw the thing out the window its on you : -)
---------- Post added at 05:48 PM ---------- Previous post was at 05:19 PM ----------
So far so good when selecting 3G the phone holds the HSPA or HSPA+ signal.

Looks like on the 1 + forums there's a lot of people having the same problem. Someone said it's going to get fixed in the next ota. Looks like the last update 38r boogered something up.

I just want to say that for those who are not aware if your phone shows low LTE signal, that has absolutely nothing to do with voice services and the quality of voice services you might get. As soon as you type in a number and hit call the phone automatically hands off connection from LTE to HSPA or 3g to make the call. This is 100% normal. VoLTE is not available on our phone nor is it activated on Tmobile yet I dont think but likely soon.
I expect that once we get official Lollipop and tmobile works out their nexus wifi calling dealio they got going on then we will also be getting the same wifi calling and texting magic. No need to get freaked out people.

tonu42 said:
I just want to say that for those who are not aware if your phone shows low LTE signal, that has absolutely nothing to do with voice services and the quality of voice services you might get. As soon as you type in a number and hit call the phone automatically hands off connection from LTE to HSPA or 3g to make the call. This is 100% normal. VoLTE is not available on our phone nor is it activated on Tmobile yet I dont think but likely soon.
I expect that once we get official Lollipop and tmobile works out their nexus wifi calling dealio they got going on then we will also be getting the same wifi calling and texting magic. No need to get freaked out people.
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I was aware that there was no Volte. I know that it is normal to go to 3g but it never dropped a call doing that before. I must disable lte so the call doesn't drop. I know this only because I have an att microcell and it forces my phone to 3g for full 5 bar voice service.

Yea microcells do weird things, the hand offs are messed up in general in android I think with them. Sorry thought you were on tmobile. Still not use to being in a forum with an unlocked phone

Birdsfan said:
Yeah but WTF, this is bull**** to have an LTE phone and force it on 3G. I'll put the SIM card back in and try on 3G for a bit but if I get frustrated and throw the thing out the window its on you : -)
---------- Post added at 05:48 PM ---------- Previous post was at 05:19 PM ----------
So far so good when selecting 3G the phone holds the HSPA or HSPA+ signal.
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Birdsfan or others,
By chance did you have wifi off? I just been doing some testing and noticed this:
wifi on/lte on = no dropped calls
wifi off/lte on = dropped calls
wifi off/lte off(3g only) = no dropped calls
If you want lte activated and make phone calls without it dropping calls then turn on wifi?
Check it out, see if it works.

I found the exact same results as tdamocles

Left the house and learned that there needs to be wifi in connected state for calls not to drop.

I just started having the same issue, exactly as described.
WiFi + LTE, no prob.
H/H+, no prob.
LTE without WiFi, phone switches to H/H+ and connects for about 2 seconds then hangs up while the signal icon goes blank, then back to LTE.
I tried reflashing stock 11S with a clean wipe, 38R.
I tried the latest nightly with a clean wipe.
Really at a loss here.

I really like the phone and CM but I need my phone to work as a phone....I'm done I'm pre-ordering the Nexus 6 Wednesday.

I dunno, I just tried reverting, via clean install, to 33r and the issue persists (did NOT go away).
Makes me worried it's a hardware thing.

Updating over LTE/3G?

I got my edge the day it came out and I've been having this problem where my apps don't sync or update over Sprints network. Apps like Bleacher Report, Facebook, Gmail, etc. I receive kiks just fine while the the phone is idle on 4G but nothing else syncs. After I got home from work today, my WiFi connected and all these emails and notifications popped up and they had a previous timestamp. My background data restriction is off and for every app too. I did the 78268 or whatever and still nothing. My network was set to automatic and I just switched it to LTE/CDMA to see if it works. Has this happened to any of you guys??
Sent from my Samsung Galaxy S6 Edge

syed239 said:
I got my edge the day it came out and I've been having this problem where my apps don't sync or update over Sprints network. Apps like Bleacher Report, Facebook, Gmail, etc. I receive kiks just fine while the the phone is idle on 4G but nothing else syncs. After I got home from work today, my WiFi connected and all these emails and notifications popped up and they had a previous timestamp. My background data restriction is off and for every app too. I did the 78268 or whatever and still nothing. My network was set to automatic and I just switched it to LTE/CDMA to see if it works. Has this happened to any of you guys??
Sent from my Samsung Galaxy S6 Edge
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I think there is def something going on i experience sorta the same stuff, sometimes i can reboot the phone and then all my emails and stuff come in. 2 weeks ago with the m7 i would wake up and usually have about 10 emails and notifications. Not anymore for some reason its like it stops the data connection.

I've got the same issue. I have no idea what is going on. I want to say it's a sprint issue but I really think Its a Samsung issue with the radios. I have moved my preferred network to home and disabled Roaming. I am hoping this helps. I think he has to do with how Spark passes off to LTE and 3G.

skinneejay said:
I've got the same issue. I have no idea what is going on. I want to say it's a sprint issue but I really think Its a Samsung issue with the radios. I have moved my preferred network to home and disabled Roaming. I am hoping this helps. I think he has to do with how Spark passes off to LTE and 3G.
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Yeah I also can't use data while in the middle of a call. I'm going to take it to Sprint and see if its a SIM issue or their network. Since so many people are having this problem, its most likely Sprint unless Samsung made a bunch of defective devices lol
Sent from my Samsung Galaxy S6 Edge

syed239 said:
Yeah I also can't use data while in the middle of a call. I'm going to take it to Sprint and see if its a SIM issue or their network. Since so many people are having this problem, its most likely Sprint unless Samsung made a bunch of defective devices lol
Sent from my Samsung Galaxy S6 Edge
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You can't use data during a call on any Spark device to my knowledge, because those devices only have the one radio. It can't do LTE while also doing 1X (SVLTE). Whenever VoLTE becomes widespread this won't be a problem.

Yea you can't use data and voice at the same time. It's always been this way. I'm just pissed I'm missing emails and notifications. I switched my network preferences to see if that helps.

found a workaround for this
Having the same problem here and this is my second one with the problem (exchanged the first one because of the screen rotation issue).
I installed Hotspot Shield from the play store and now my notifications from all apps are coming in in a timely manner. It makes your battery drain faster though. Hopefully Sprint will push an update to fix this soon. In the meantime this works, at least for me.

astroblaser said:
Having the same problem here and this is my second one with the problem (exchanged the first one because of the screen rotation issue).
I installed Hotspot Shield from the play store and now my notifications from all apps are coming in in a timely manner. It makes your battery drain faster though. Hopefully Sprint will push an update to fix this soon. In the meantime this works, at least for me.
Click to expand...
Click to collapse
I just switched my network mode to CDMA only and now notifications come through on 3G and my battery has been better since I switched the setting. Still would love the fix
Sent from my Samsung Galaxy S6 Edge

Poor S8+ data hangover...Bad 3G/4G signal/performance

I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....

Go to settings, connections, mobile networks, and tap network mode. Is 4G/3G/2G enabled? If not, enable it, and see if 4G connects

galaxyYtester said:
Go to settings, connections, mobile networks, and tap network mode. Is 4G/3G/2G enabled? If not, enable it, and see if 4G connects
Click to expand...
Click to collapse
Please READ CAREFULLY what I wrote.

stefan063 said:
I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....
Click to expand...
Click to collapse
Which Variant do you have? I had a similar issue when I first bought the Verizon S8+ to use on Cricket/AT&T. I ended up having to return it and get the AT&T one. The first one I had would run on 4G or LTE with 4-5 bars and would constantly loose service, and every time I would try to make a call it would switch to 3G and tell me that international calling was not on my plan until 3 or more attempts later. Then it would finally make the call on 3G network. Since I've swapped I haven't had this problem. No I still don't get as good of signal as my iPhone 7 plus but it's comparable now.

AndroiderM said:
Which Variant do you have? I had a similar issue when I first bought the Verizon S8+ to use on Cricket/AT&T. I ended up having to return it and get the AT&T one. The first one I had would run on 4G or LTE with 4-5 bars and would constantly loose service, and every time I would try to make a call it would switch to 3G and tell me that international calling was not on my plan until 3 or more attempts later. Then it would finally make the call on 3G network. Since I've swapped I haven't had this problem. No I still don't get as good of signal as my iPhone 7 plus but it's comparable now.
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International Sim-Unlocked 955F variant (EXYNOS). It is OK to switch from 4G to 3G if operator doesn't support VoLTE on its network. But that is not my problem. Full bar 3G, surfing web and it switches to 2G. NOT NORMAL. Same as on 4G to 3G. Full 4G bars.

If you have tried factory reset and all other trouble shooting, I'd just set up a RMA and get a new one. If you are in the US maybe the Snapdragon if you're willing to sacrifice root. Sounds really annoying to have a phone with LTE and be stuck using 2G. Just my 2 cents

Got the same issue...
stefan063 said:
I thought that S8+ has better antenna and modem than my iPhone 7+. But I made mistake. It is far worse than 7+. Even I have full bars on 3G it switches back to 2G and if on 4G it switches on 3G. WTF Samsung!?
I need to access service menu and set 3G/4G only but I have another thread about service menu which I cannot access....
Click to expand...
Click to collapse
Hi Friend, it so true...
I use S8 Plus and experience the same issue. If we only use S8, we will never realized this fail but if we use another device like Sony Experia or Mi5 (my experience), we will realized that S8 has worse signal receiver. I complained it to Samsung through Twitter, just say they will check on it and never get back to my last message.
Kind of mess for an expensive phone and high class brand.

Same with me
mdarsika said:
Hi Friend, it so true...
I use S8 Plus and experience the same issue. If we only use S8, we will never realized this fail but if we use another device like Sony Experia or Mi5 (my experience), we will realized that S8 has worse signal receiver. I complained it to Samsung through Twitter, just say they will check on it and never get back to my last message.
Kind of mess for an expensive phone and high class brand.
Click to expand...
Click to collapse
I'm having the same problem, with 3G makes a hang out signal, and I need to turn on the airplane mode and turn off to get signal and H+ or 4G, did you find a solution with this issue?