I recently updated my ROM to 1.93 with Radio .05 and now my phone is not finding any service, it just has the ! mark on top. I went into connection settings and used both manual and auto settings and it cant find my t mobile network. I am using T mobile in the US and was wondering if any of you had any suggestions. Thanks for your help
Kutthoat5150 said:
I recently updated my ROM to 1.93 with Radio .05 and now my phone is not finding any service, it just has the ! mark on top. I went into connection settings and used both manual and auto settings and it cant find my t mobile network. I am using T mobile in the US and was wondering if any of you had any suggestions. Thanks for your help
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Click to collapse
hi,
did u find other providers or is the list completely empty ?
try the following 3 points of success
1)just try whether you can make a emergency call
2)hold your diamond to a speaker in your near and listen whether there is a strange noise(turn on the speaker loud)
3) if you had another pda try the sim in the device
post the results....
TomDaDj said:
try the following 3 points of success
1)just try whether you can make a emergency call
2)hold your diamond to a speaker in your near and listen whether there is a strange noise(turn on the speaker loud)
3) if you had another pda try the sim in the device
post the results....
Click to expand...
Click to collapse
thanks for the reply bro
in my area, t mobile and AT&T show up as networks but my phone will just not connect to them, its just says "searching" and stays that way
1) is 911 the only emergency call you can make cuz i really dont wanna get in trouble with the law you know haha
2) i do hear a strange noise when i turn the volume up
3) i put my sim in my old n95 and it works just fine
its like my diamond is not even detecting my SIM card, i put my friends AT&T SIM in it and it doesnt detect that either
Kutthoat5150 said:
thanks for the reply bro
in my area, t mobile and AT&T show up as networks but my phone will just not connect to them, its just says "searching" and stays that way
1) is 911 the only emergency call you can make cuz i really dont wanna get in trouble with the law you know haha
2) i do hear a strange noise when i turn the volume up
3) i put my sim in my old n95 and it works just fine
its like my diamond is not even detecting my SIM card, i put my friends AT&T SIM in it and it doesnt detect that either
Click to expand...
Click to collapse
just read this http://forum.xda-developers.com/showthread.php?t=434950
i've also got such a strange problem but now all works fine...
and btw at this crazy time i put my sim in a old nokia 3310 and he found
a network immediately then i put it back in 3 different pda's (all of them are working up to 100 percent) and all 3 devices found NO network...
at this time iam also going really crazy and desperate
i dont know the reason for my success, i just let the simcard over the night in a other pda and on the next morning magicaly all works fine...
can u choose between gsm and wcdma?
just do this
select the automatic provider pickup and the wait over 10 minutes...
when he found a network after a long waiting time try connect to gprs.
if gsm will work and you can call someone and gprs will not works simultaniously u know you have the same fun like me
TomDaDj said:
just read this http://forum.xda-developers.com/showthread.php?t=434950
i've also got such a strange problem but now all works fine...
and btw at this crazy time i put my sim in a old nokia 3310 and he found
a network immediately then i put it back in 3 different pda's (all of them are working up to 100 percent) and all 3 devices found NO network...
at this time iam also going really crazy and desperate
i dont know the reason for my success, i just let the simcard over the night in a other pda and on the next morning magicaly all works fine...
can u choose between gsm and wcdma?
Click to expand...
Click to collapse
Okay ill take a look at that, and yes I can choose between Auto, GSM, and WCDMA. I usually leave it on auto, but even when I switch to GSM it does not pick anything up.
TomDaDj said:
just do this
select the automatic provider pickup and the wait over 10 minutes...
when he found a network after a long waiting time try connect to gprs.
if gsm will work and you can call someone and gprs will not works simultaniously u know you have the same fun like me
Click to expand...
Click to collapse
holy potatoes i dont know what i just did but it worked!!! i put the SIM in my old N95 and it found the t mobile network. i sent some messages, made some phones calls, then put the SIM back in my diamond and it found the network!! wow thanks a bunch for your help bro, i cant thank you enough
okay scratch that it worked for a little bit, until I started installing some apps and had to restart my phone, now it cant find a network again when it booted back up. Is it the apps that im installing that might be causing this?
no man i dont think so...
i think that was a mistake by the sim or by tmobile self (i think if they have any problems, they didnt say anything to their costumers )
if you have the possibility to go a little bit away from your home, for example into downtown then do this and test if u get there a signal.
i live in vienna - austria. vienna has 23 districts - when i had this terrible problem - at least in 7 disctricts i became immediately a signal and in my own district i became to no time a gsm signal (or more accurately described - i became a gsm sigal after 5-10 minutes waiting time (every time i turn off and turn on the phone, always i had to wait about 5-10 minutes) then i could make calls but no internet connection was possible. but in the other 7 disctricts where ive been, all works fine
crazy or not crazy
TomDaDj said:
no man i dont think so...
i think that was a mistake by the sim or by tmobile self (i think if they have any problems, they didnt say anything to their costumers )
if you have the possibility to go a little bit away from your home, for example into downtown then do this and test if u get there a signal.
i live in vienna - austria. vienna has 23 districts - when i had this terrible problem - at least in 7 disctricts i became immediately a signal and in my own district i became to no time a gsm signal (or more accurately described - i became a gsm sigal after 5-10 minutes waiting time (every time i turn off and turn on the phone, always i had to wait about 5-10 minutes) then i could make calls but no internet connection was possible. but in the other 7 disctricts where ive been, all works fine
crazy or not crazy
Click to expand...
Click to collapse
thanks for the help man your awesome, i really appreciate it. but i think ive finally found the issue, when i restarted the phone it couldnt locate any network. but then i started to charge it and boom!! it found it again! so does the battery need to be near full for it to locate a signal? haha wow, craziest phone ive ever had!
Kutthoat5150 said:
thanks for the help man your awesome, i really appreciate it. but i think ive finally found the issue, when i restarted the phone it couldnt locate any network. but then i started to charge it and boom!! it found it again! so does the battery need to be near full for it to locate a signal? haha wow, craziest phone ive ever had!
Click to expand...
Click to collapse
thx - i do what i can
but i dont think that the problem is gone - you will see - it wont work long. i signal must be there - it should does make no matter whether the battery is - not load - half load or full loaded. it must always work! at 1% of battery it works on my device - it is impossible that that is the problem of you. go to the next tmobile store and let change your sim card - or make it like me - just wait 4 days - hope tmobile have fixed their problems - and be happy if it works.
otherwise it was a hardware issue and you have to send it back to tmobile for repair. but if you do this you must restore the stock software... otherwise you lose your guaranty!!
TomDaDj said:
thx - i do what i can
but i dont think that the problem is gone - you will see - it wont work long. i signal must be there - it should does make no matter whether the battery is - not load - half load or full loaded. it must always work! at 1% of battery it works on my device - it is impossible that that is the problem of you. go to the next tmobile store and let change your sim card - or make it like me - just wait 4 days - hope tmobile have fixed their problems - and be happy if it works.
otherwise it was a hardware issue and you have to send it back to tmobile for repair. but if you do this you must restore the stock software... otherwise you lose your guaranty!!
Click to expand...
Click to collapse
oh i forgot to say in the first post that my diamond is unlocked, im just using t mobile as my carrier on it but my phone is not locked to any network. so im not sure if its t mobiles fault but just my phone. My SIM card worked fine right away when i put it in my N95 8GB, but my diamond did not pick it up right away when i put it in. I had to plug in my charger first then a few seconds later it found a signal. Not sure why it did that, maybe just needed a little boost to grab that signal or something. Could it be the ROM or Radio I am using?
Kutthoat5150 said:
oh i forgot to say in the first post that my diamond is unlocked, im just using t mobile as my carrier on it but my phone is not locked to any network. so im not sure if its t mobiles fault but just my phone. My SIM card worked fine right away when i put it in my N95 8GB, but my diamond did not pick it up right away when i put it in. I had to plug in my charger first then a few seconds later it found a signal. Not sure why it did that, maybe just needed a little boost to grab that signal or something. Could it be the ROM or Radio I am using?
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Click to collapse
ok, then send it back to htc, or bring it to the store back where you bought it.
but do this only if you really see no more chance to fix it...
remember what i write, i try my sim in a nokia 3310 and it works, a few seconds later in diamond and 2 other pda's i got no network - back in nokia and it works i dont know how this could be possible!!!
i also try 5 different roms and all radios that exists too - and with all was the same - just nothing.
its your choice my friend - be patient and hope for better times or send it back to repair. but then also upload the original htc rom, radio and spl
i go now sleep - at vienna its 23 o'clock iam verrrrrrry tired from a hard working day...
but post further results, i read it tomorrow...
TomDaDj said:
ok, then send it back to htc, or bring it to the store back where you bought it.
but do this only if you really see no more chance to fix it...
remember what i write, i try my sim in a nokia 3310 and it works, a few seconds later in diamond and 2 other pda's i got no network - back in nokia and it works i dont know how this could be possible!!!
i also try 5 different roms and all radios that exists too - and with all was the same - just nothing.
its your choice my friend - be patient and hope for better times or send it back to repair. but then also upload the original htc rom, radio and spl
i go now sleep - at vienna its 23 o'clock iam verrrrrrry tired from a hard working day...
but post further results, i read it tomorrow...
Click to expand...
Click to collapse
thanks so much for your help bro, ya every time i unplug it from my charger it loses its signal, so i have to keep it charged just to talk on it or text. so i think i am going to have to send it back to htc for repair as i dont really know what is going on with it. thanks again man, really appreciate the help
same here
i have a very similar problem.
i can only make and receive calls on the wcdma network, but not on gsm.
in both, it says that i have reception, but when i try to make a call it just goes silent and after a while the call is ended.
if i dial *102# which is the number to access your mobile credit status, on wcdma it opens a little bubble coming from the network icon and says the correct values, on gsm it simply waits and says connection interrupted.
i have tried several roms and radios, and the problem persists...
you can view my current setup in my signature.
any ideas, what could be the problem? is it the hardware? does this have to do something with hungary?
the sim works just fine, since 1997 (i have no idea how can 3g work on this little baby, but it does) =D
any help appreciated! tx
sampi604 said:
i have a very similar problem.
i can only make and receive calls on the wcdma network, but not on gsm.
in both, it says that i have reception, but when i try to make a call it just goes silent and after a while the call is ended.
if i dial *102# which is the number to access your mobile credit status, on wcdma it opens a little bubble coming from the network icon and says the correct values, on gsm it simply waits and says connection interrupted.
i have tried several roms and radios, and the problem persists...
you can view my current setup in my signature.
any ideas, what could be the problem? is it the hardware? does this have to do something with hungary?
the sim works just fine, since 1997 (i have no idea how can 3g work on this little baby, but it does) =D
any help appreciated! tx
Click to expand...
Click to collapse
hi,
i was really wondering why this strange problem happens now on more and more users... thats really interessting....
did you try the sim in a other phone?
if it there also not work -> go to a store from your provider and told them that u have a old sim card which not works with your current phone.
normaly they should give you immediately a free new sim card.
and please tell me whether you have tmobile as your provider.
just for info because you write, that u can use 3g.... when i recieved my diamond i also had an old sim card which doesnt support UMTS or 3G but HSDPA was working, that cause because the sim is not responsible for this communication mode - only your phone!
the problem the guy has in this thread is almost exactly what i am experiencing right now
http://forum.xda-developers.com/showthread.php?t=409733&highlight=network+problem
except mine used to just keep restarting an wouldnt boot up so i just let it do that for about 10 min and it eventually loaded up. Is there a specific number I can dial that will reset my SIM card settings or something? My phone has been like this for a couple days now and it sucks not being able to call or text anybody.
I thought I solved this problem when I plugged in my charger to my phone, then it started finding the EDGE network but my signal was still being dropped when I made calls, only some text would go through and thats it. Please guys, somebody save me from this misery!
Kutthoat5150 said:
the problem the guy has in this thread is almost exactly what i am experiencing right now
http://forum.xda-developers.com/showthread.php?t=409733&highlight=network+problem
except mine used to just keep restarting an wouldnt boot up so i just let it do that for about 10 min and it eventually loaded up. Is there a specific number I can dial that will reset my SIM card settings or something? My phone has been like this for a couple days now and it sucks not being able to call or text anybody.
I thought I solved this problem when I plugged in my charger to my phone, then it started finding the EDGE network but my signal was still being dropped when I made calls, only some text would go through and thats it. Please guys, somebody save me from this misery!
Click to expand...
Click to collapse
to 100% the same what i've gotten and to 99% the same problem which you have.
BUT its very interessting, all guys what had this problem use t-mobile as the provider.... very strange.....
BTW because in the thread http://forum.xda-developers.com/showthread.php?t=409733&highlight=network+problem
the guy postet
Intradvocate said:
Okay, nope not fixed... Flashed it with 1.37, connected to the network for a few seconds, dialed somebody and no ring or anything, but when i called my phone i could hear my own voice. So I guess i have to send it in for repair. Damn.
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Click to collapse
at this bad time i also restore to stock rom 1.37 and he found in 1 second a signal BUT then it was also impossible to make an internet connection...
ya i was starting to think it was tmobiles problem until I put my friends AT&T SIM in and it was doing the same thing. It would just say "searching" and thats it, and well I just charged up my phone to almost full battery and it located a signal again. But it still drops calls almost immediately and I can only send text. Does the 1.93 ROM do anything to the Radio or antenna because it has been like this even when I flash back to earlier ROMS and radios. I am almost sure that flashing or changing radios will not solve the problem because I have done that countless times already.
hello .. be nice this is my first post !!
i recently came into the possesion of one of these little phones .. however i had no intentions of using this on t-mobile and wished to unlock the phone to be able to use on o2 .. however .. after following this guide http://forum.xda-developers.com/showthread.php?t=853674 which seems to have done the trick as the t-mobile gumpf has disappeared when turning the phone on but now i have a screen that asks for sim network unlock pin to which i dont have one and dont know where to obtain one .. i dismiss it and it takes me to the home page .. wifi works perfectly but i cant send or receive both text messages and calls apart from emergency ones !! .. i have since purchased another tmobile chip and the sim network unlock pin screen is no longer there and would appear to have a signal and two arrows pointing up and down and the g changes back and forth with an h .. but still no calls or texts .. can someone please tell me that i havent killed the phone and there is a fix !! .. i will admit i am a complete newbie to all this so go gentley !!
if the phone was blocked by the network what would my symptoms be .. only asking as im paranoid that i may have been sold a dud phone !!
many thanks in advance
chris !!
Hi and welcome to the forums
Unfortunately, I don't think the thread you linked has anything to do with being able to use a SIM card from another network on your phone. If I'm not mistaken it's more for removing the splash screen (eg. the T-Mobile one when you start up the phone) and also to get rid of the custom apps that networks like putting on their phones.
What you want is an "UNLOCK" code that you can either get online or obtain from T-Mob themselves - I've not done it personally before but you may have to shell out some cash for the code.
Have you tried using the original SIM card that the phone came with?
P.S. The changing G and H with the two arrows are related to the Mobile Data Connection being used by your phone. The arrow pointing up being upload, and down being download.
ah ok .. hense my newbie ness !! .. oh ok .. i thought that meant it would unblock the phone to be able to use on any network !!
i dont have the original sim .. but when putting the o2 sim in i dont get the g & h or the arrows .. and the little graph that shows the reception !! .. however when i put the "new" t-mobile chip in .. it all appears but still unable to make calls etc !! .. just a bit confused as to why the phone doesnt work on t-mobile !!
thanks for the welcome !!
for some reason i thought id change the network on the phone to orange and it seems to be working ?? .. am i missing something ??
then soon to stop working again .. since found out the phone has been blacklisted .. so it looks as though ive been sold a dud .. is there anything i can do to get the phone working again ??
Extremely unclear what you are trying to do. "Blacklisted"? By whom and how? I don't even know what that means.
If you want to unlock your phone to use on any GSM network, as LetoKynes said above, you need an unlock code. Buy one online and when your phone asks for the code, enter it.
i was trying to unlock it to use on any network .. but then found out u the unlock code .. so as i was eager to crack on and use the phone i bought a sim to match the network it was on .. it was working fine but then suddenly stopped working .. i rang the network and the phone has since been reported lost so its been blacklisted !! .. and as i purchased the phone recently i guess ive been had over .. as i am unable to give the original owners details !! .. pretty gutted !! .. still the wifi still works ok !!!
Can this international note 2 work on U.S. T-mobile? Comes with chinese jellybean software idk if it's even real or not......
http://pdadb.net/index.php?m=specs&id=4001&c=samsung_gt-n7102_galaxy_note_ii
Yes it will work. N7102 is dual sim card
Edit
JoJo2211 said:
will this Galaxy Note II n7102,WCDMA/GSM, work in the USA? I want to use AT&T and T-Mobile. Thanks
Click to expand...
Click to collapse
tee1 said:
Short answer no right now.
Click to expand...
Click to collapse
Thanks for the info! It's just weird that it comes with chinese software. Any idea if i'd get 4g? (HSPA+)
I think the default language for the N7102 is Chinese.
As for 4G, im not sure. It should though since its Quad Band
Edit, checked the N7102 thread and saw this
http://forum.xda-developers.com/showpost.php?p=37317017&postcount=554
Oh so it won't work? Wow great thing I didn't decide to get it.
Not sure what country you are in but HSDPA+ isnt 4G ... those guys with N7102 outside china appear to have continued issues & I dont think a they will ever get what they hoped.
I completely dropped my plan to get one after reading the threads.
My need is for one sim for calls & texts & Another for Data only (im in UK) so I got a N7105 & for the data sim a Huawei E586 HSDPA+ Mifi router which also has sms send capability.
The 7102 in my opinion has too many down sides just to get 2 live call lines.
No warranty ... already people are reporting faulty units.
Samsung gt-n7102 reboot loop
Hi guys,
I'm new here so I hope am at the right place. Anyway I tried rooting my gt-7102 and now it on continuous restart loop. I tried going to recovery mode by pressing the power + home and the volume up button but it just keeps on restarting showing a white blank screen which lasts for about ten seconds or so. I tried using Smart phone flash tool but it keeps on saying searching. Tried to work with mtk droid tools but it says device not connected. I can't connect to the device in any way as keeps restarting since it is continuously connected and disconnected from my pc after every ten seconds or so. pliz someone help.
Thanks
kibaya said:
Hi guys,
I'm new here so I hope am at the right place. Anyway I tried rooting my gt-7102 and now it on continuous restart loop. I tried going to recovery mode by pressing the power + home and the volume up button but it just keeps on restarting showing a white blank screen which lasts for about ten seconds or so. I tried using Smart phone flash tool but it keeps on saying searching. Tried to work with mtk droid tools but it says device not connected. I can't connect to the device in any way as keeps restarting since it is continuously connected and disconnected from my pc after every ten seconds or so. pliz someone help.
Thanks
Click to expand...
Click to collapse
This phone is an MTK or MediaTek phone, it has a different way of rooting it, Google FramaRoot and try with that. im not even sure how you were able to try to root it since i cant get into download mode in my phone but anyway, to unbrick the phone i guess you can try a jig or if not Google unbrick MTK and do some research. Good luck!
Hi everyone. I bought a galaxy note 2 from a friend two days ago and now I cant make calls, use 4g data or send/recieve sms, everything else works (including wifi), let me be as clear as possible as to what happened.
I purchased the phone from my friend 2 days ago and it was working fine. its a Telcel (mexico) galaxy note 2 N7100. I tested the device fully and everything was working, I made calls etc and data was wotking also.
I took the phone home and used a soft damp cloth to wipe the battery cover clean, it was greasy and all note I removed the battery cover from the device. Afterwards I replaced the battery cover, connected to my home wifi and then there was a message on my phone "set up software update' which i agreed to .
I then switched my sim card with a different one( it had call credit on it). and upon powering on the phone, i was greeted with a screen with a small padlock and the words "SIMLOCK". i swiped up and bypassed that screen. MY PHONE WAS SHOWING 4 SIGNAL BARS BUT UPON TRYING TO MAKE A CALL OR SEND A TEXT MESSAGE, I keep getting error messages such as "NOT REGISTERED ON NETWORK".
I have tried every single thing to get rid of this. I even purchased galaxsim unlock from the playstore and it claimed to have removed the simlock but i kept getting that screen with the padlock and simlock message and also no calls or text can be send or recieved. I tred different custom roms, official roms, I tried flashing different kernels, modems etc you name it and still I cant use my phone.
The phone was on android version 4.1.2, now its on the official/rooted 4.3. I read online that samsung may have region locked my phone but this is very strange because my friend was using it for several months. and the issue arised when I took it home. I have never given up on an android device EVER. I have spent days trying and succeeding in unbricking phones but for the first time i actually feel helpless.
I have used so many samsung devices befoe including a galaxy s4 from europe without any problems.
Lasty even when there is no simcard in the phone, THE PHONE IS SHOWING 4 TO 5 SIGNAL BARS ALL THE SAME, IS THIS NORMAL??? also the phone detects the simcard, i can see my contacts etc. The phone can search and detect available networks also but when i try to connect to a network manually it fails to do so, or sometimes it will connect but i still get that message saying network not available.
also the phone only allows emergency calls, but when I try to to dial emergency it says OUT OF SERVICE AREA. Someone please help me if you can
Zantetsuken1983 said:
Hi everyone. I bought a galaxy note 2 from a friend two days ago and now I cant make calls, use 4g data or send/recieve sms, everything else works (including wifi), let me be as clear as possible as to what happened.
I purchased the phone from my friend 2 days ago and it was working fine. its a Telcel (mexico) galaxy note 2 N7100. I tested the device fully and everything was working, I made calls etc and data was wotking also.
I took the phone home and used a soft damp cloth to wipe the battery cover clean, it was greasy and all note I removed the battery cover from the device. Afterwards I replaced the battery cover, connected to my home wifi and then there was a message on my phone "set up software update' which i agreed to .
I then switched my sim card with a different one( it had call credit on it). and upon powering on the phone, i was greeted with a screen with a small padlock and the words "SIMLOCK". i swiped up and bypassed that screen. MY PHONE WAS SHOWING 4 SIGNAL BARS BUT UPON TRYING TO MAKE A CALL OR SEND A TEXT MESSAGE, I keep getting error messages such as "NOT REGISTERED ON NETWORK".
I have tried every single thing to get rid of this. I even purchased galaxsim unlock from the playstore and it claimed to have removed the simlock but i kept getting that screen with the padlock and simlock message and also no calls or text can be send or recieved. I tred different custom roms, official roms, I tried flashing different kernels, modems etc you name it and still I cant use my phone.
The phone was on android version 4.1.2, now its on the official/rooted 4.3. I read online that samsung may have region locked my phone but this is very strange because my friend was using it for several months. and the issue arised when I took it home. I have never given up on an android device EVER. I have spent days trying and succeeding in unbricking phones but for the first time i actually feel helpless.
I have used so many samsung devices befoe including a galaxy s4 from europe without any problems.
Lasty even when there is no simcard in the phone, THE PHONE IS SHOWING 4 TO 5 SIGNAL BARS ALL THE SAME, IS THIS NORMAL??? also the phone detects the simcard, i can see my contacts etc. The phone can search and detect available networks also but when i try to connect to a network manually it fails to do so, or sometimes it will connect but i still get that message saying network not available.
also the phone only allows emergency calls, but when I try to to dial emergency it says OUT OF SERVICE AREA. Someone please help me if you can
Click to expand...
Click to collapse
to resolve this the easy away is using an box like octoplus, to repair your imei, try the tutorials in the forum, have a lot of them, but i think the only way is through box service repair im in brazil but you can search some technichal assistence in your area
Thanks but no
I WONT SPEND ANY CASH TO REPAIR THIS BECAUSE I AM NOT AT FAULT. i DID NOTHING AND I ASSURE YOU I WOULD RATHER THROW THIS AWAY THAT REPAIR IT BY SPENDING CASH CAUSE THIS IS MAKING ME REALLY UPSET
Zantetsuken1983 said:
I WONT SPEND ANY CASH TO REPAIR THIS BECAUSE I AM NOT AT FAULT. i DID NOTHING AND I ASSURE YOU I WOULD RATHER THROW THIS AWAY THAT REPAIR IT BY SPENDING CASH CAUSE THIS IS MAKING ME REALLY UPSET
Click to expand...
Click to collapse
Download patched mk4 kernel and patched mj5 bootloader from this link flash via odin on pda tab. https://drive.google.com/folderview...&usp=sharing&tid=0B6MIUd7HJudAbU5YaGkzOUowMG8
I have a brand new Z Play running 7.1.1 and it looses the service provider about 3 to 4 times a day. It resolves itself after one or two restarts. If i try to make a call it says the sim its not supported. If i try to manually select AT&T's network it says its not permited (or sth like that). Is there a work around this issue? the phone i know for a fact that had not been used ever but i dont have the warranty
HM... I have almost the same issue! When I come to work 4G shows full, but there is no internet. After a little while at the corner of signal strength triangle a little cross is showing. After some time it resolves itself. Very annoying!! I thought that was something to do with the location (no 4G signal or something), but realised it started to happen only when I upgraded to 7.1.1 on my Chinese XT1635-03 - on 6.x 4G worked flawlessly.
I've got this issue with my phone, too. But it seems to depend on the location. It appears only if I'm at work and I have the feeling it only happens when there are too many people around me. But can not tell for sure..