4G stopped working. - Redmi K20 Pro / Xiaomi Mi 9T Pro Questions & Answe

As the tittle tells you, 4G stopped working on my Raphaelin today(18-09-19) at approx 0150hrs. It was working fine before that and that to be on both the sims. Now none of the sims work when 4G is enabled and will only work if set to 3G mode. Tried out everything. Then thought it to be a ROM issue and factory reset it. Still not working. Need confirmation on - "if it is a hardware issue."
I cant even unlock the bootloader and flash it to android 10 update to test out the possibility of a bug fix.

At risk of stating the obvious, have you confirmed with another phone that you actually have a 4G signal?
Similar has happened to me before when the nearby cell tower was under maintenance.

fasty said:
At risk of stating the obvious, have you confirmed with another phone that you actually have a 4G signal?
Similar has happened to me before when the nearby cell tower was under maintenance.
Click to expand...
Click to collapse
yes i did confirm with 2 other phones and sim cards are sure working

Ohhkay.... It started working again some how a few minutes back .. no idea how.. but it is working now.... But i am confirmed that it wasn't the cell tower's or sim card's fault coz it was working on other devices all right.
Any guess what might be triggering these events?

Related

Help revive my dead Kaiser

I have a big problem which I hope all you Kaiser gurus can offer some advice:
I got my Kaiser two weeks ago, pop in my USA T-mobile sim card (GSM only) and it worked perfectly. I then went over to Taiwan and the device was put in Airplane mode for about 10 days. When I get back to the states, the phone no longer works; all other features of WM6 works except it the phone service.
It cannot find the t-mobile network regardless in auto or manual network selection mode. I tried the SIM card on my other phone and it works perfectly so that rules out the SIM card. I did a hard reset and it didn't cure the problem.
Question is, can the altitude or air cabin pressure somehow killed the phone portion of the unit?
What other diagnostic methods do you recommend?
Hmm I dont know if this is a good idea but emergency services like 911 should still work, even without service. And by that I mean without being signed up for service. So it might help to test 911, then hang up if it rings once. Just to see if your radio still works. If it does, then the issue might be that the phone is not configured correctly to T-mobile.
Now this is only true in the USA. I'm not sure where you are from. But given that the USA has just about the oldest infrastructure in any developed nation, I'm confident it can only be better where you are from.
No, 911 does not work. Does this mean my radio is fried? What can I do?
hmm... this sounds like a bad radio flash gone wrong... and not saying so!
I tried it with my friend's AT&T Sim and it worked perfectly. Does it mean it's the carrier's problem?
it means probably your phone got sim lock somehow. Just do hard spl and unlock it.
I'd get another T-Mobile sim card if your device works fine with an AT&T sim. I realize you said your T-Mobile sim works great in another phone, but that's the only thing that makes sense.
Ok I'll try that. Problem is, I have several other T-mobile lines and I tried those SIMS already and no cigar.
Anyone else can contribute any ideas? HTC is not support me because this is an import phone.
mutantblack said:
it means probably your phone got sim lock somehow. Just do hard spl and unlock it.
Click to expand...
Click to collapse
This is MISLEADING info !
Hard-SPL = CID unlock = ROM options
it does NOT unlock the SIM !!
hello all
i got the "no sevice" problem which looks like the same as Valleydog's.
i got my kaiser about 1 month, everything goes very well
today im in class and turn on the flight mode.
when i turn off the flight mode, it cant find the sevice any more,it tells "no sevice"
i cant dial any number including 911,86,110 etc......i swap my friends' cards they couldnt work,too
oh,just a nightmare to me, i flash the htc ship rom(which contains a radio),problem still...
could anybody help me, was it suddenly sim locked? possible?
Why such bad thing happens on me(good person)...........
KAIS130 with hspl v1,flashed many roms without problem,just this problem suddenly scares me
Sheng
This happened to me briefly the other day; running a stock T-Mobiles Vario III with NO rom flashing done to it.
I went to make a call and there was no service. The phone had been in my pocket for a while. I soft reset it and it worked after that, but took about 5 minutes before it picked up a signal... It's been fine since though.
This really sucks... I will head down to the T-mobile store and try out all their SIM cards until I find one that works.
The thing that puzzles me is that the other carrier's SIM (AT&T) works fine
Why such bad thing happens on me(good person)...........
Click to expand...
Click to collapse
Haha....im sure its got nothin to do with that....mebbe u dun pray enough
Here's an update...I tried 3 working SIMS cards in T-mobile store on my phone and it still does not get signal.
Very frustrated at this point.
My phone worked intermittently at one point but now it's dead again. What a piece of crap.
This is so annoying, and HTC have no answer regarding this issue.
It is clearly not a hardware fault!!!
I have the same problem & it is so frustrating you guys can't imagine.
I have always loved HTC machines, but I am thinking never again!
Regards
Andre'
saper747 (andre),
Where are you located and what have you done to troubleshoot the problem so far?
Did you call T-Mobile to see if they have something configured wrong on their end? If the phone works with an AT&T sim, it would seem something on T-Mobile's side wasn't right.
There is nothing wrong as confirmed by T-mobile, the same SIM works on any other unlocked phone except my Kaiser
valleydog said:
saper747 (andre),
Where are you located and what have you done to troubleshoot the problem so far?
Click to expand...
Click to collapse
I am located in Israel I have tried 7 sim cards (2 -cellcom,3 -orange,1 -02 uk& 1-t-mobile ) non of them work on my Kaiser but they do in any other phone!!!
I have done soft resets & hard resets nothing helps.
it all started after I was trying to roam to another country and a day later my battery went dead, the next thing i new it wouldent register any network ,

3G Radio activity

Hello all,
I am having some issues with the 3G connection with my Dream that started a few weeks ago. There are times when it works just fine and I am able to use apps/maps/browser with no difficulty what-so-ever. Then out of no where it will stop working. I will have 3 or 4 bars, and it says I am connected at 3G, but only outgoing ('Up') arrow on the status bar lights up, while the incoming ('Down') arrow will not light up at all. Then finally after various wait times (2 to 10 minutes) the '3G' will disappear and light back up as if the radio is resetting and will work again for a few minutes before repeating the same process over again. If I enable the 2G only connection it works just fine. I do not see any pattern or correlation to this disconnect. I have tried wiping, reformatting the SD and re-flashing my phone with no help...
Any ideas? TIA
ROM: Cyan 4.0.4 Stable
Recovery Image: Cyan 1.4
Radio: 26I
Try airplane mode when this problem occurs.
maxisma said:
Try airplane mode when this problem occurs.
Click to expand...
Click to collapse
You mean enable airplane mode and then disable it again to reset the connection? I just tried it...did not help. Still sending information out but not downloading anything in return...
bethel03 said:
Hello all,
I am having some issues with the 3G connection with my Dream that started a few weeks ago. There are times when it works just fine and I am able to use apps/maps/browser with no difficulty what-so-ever. Then out of no where it will stop working. I will have 3 or 4 bars, and it says I am connected at 3G, but only outgoing ('Up') arrow on the status bar lights up, while the incoming ('Down') arrow will not light up at all. Then finally after various wait times (2 to 10 minutes) the '3G' will disappear and light back up as if the radio is resetting and will work again for a few minutes before repeating the same process over again. If I enable the 2G only connection it works just fine. I do not see any pattern or correlation to this disconnect. I have tried wiping, reformatting the SD and re-flashing my phone with no help...
Any ideas? TIA
ROM: Cyan 4.0.4 Stable
Recovery Image: Cyan 1.4
Radio: 26I
Click to expand...
Click to collapse
it could be your phone
but also it could be 3g service in your area.. it could be unstable or weak..
i.e. i get terrible 3g service in my nearest mall,but 2g works fine.
but in my house my 3g service is almost perfect.
R u using a datasim or not??
Check with ur telecom operator. Sometimes u need to be using a data only sim to be using 3g on the g1. It happened to me. Otherwise there might be some apn settings wrong or missing.
Thanks for the reply guys. I thought it could be the 3G in my area but I have had my phone for well over 6 months now and it has worked great at my house. I know t-mobile is still working on their 3G roll-out so it could be that as well. I really hope it is not my phone but with my luck...who knows...
As far as the datasim, I am not sure. Like I said, I have had my phone for 6+ months and 3G used to work just fine. Is there any way I can tell by looking at my T-mobile SIM to see if it is a datasim or not?
My G1 is doing the same thing!
I am in Atlanta and i have been noticing the same exact problem. I am also noticing that i am suddenly getting mobile versions of websites that i usewd to always get the full web version. I am on cyan 4.1.7. Not sure if it is the rom or the service but nonetheless i am experiencing the exact same problem.
Weird stuff... I am in Los Angeles in case people are wondering.
bethel03 said:
Thanks for the reply guys. I thought it could be the 3G in my area but I have had my phone for well over 6 months now and it has worked great at my house. I know t-mobile is still working on their 3G roll-out so it could be that as well. I really hope it is not my phone but with my luck...who knows...
As far as the datasim, I am not sure. Like I said, I have had my phone for 6+ months and 3G used to work just fine. Is there any way I can tell by looking at my T-mobile SIM to see if it is a datasim or not?
Click to expand...
Click to collapse
if you want to take more precautions..
u can go to a corporate tmobile store and ask them to replace your sim card. its just something basic. some sim cards go bad. i had to replace mine twice.
if you go to a booth in the mall or whatever they may charge u $25. in a corporate store,its usually free.
or you can call tmobile and ask them to take off your data plan and then add it cak on again.. this again is a basic troubleshoot for data related problems..
and if it is your phone(i assume you bought ur phone from tmobile) you should have a 1 year warranty. tmobile might exchange or call htc... all you really have to do is pay shipping.
brian_v3ntura said:
if you want to take more precautions..
u can go to a corporate tmobile store and ask them to replace your sim card. its just something basic. some sim cards go bad. i had to replace mine twice.
if you go to a booth in the mall or whatever they may charge u $25. in a corporate store,its usually free.
or you can call tmobile and ask them to take off your data plan and then add it cak on again.. this again is a basic troubleshoot for data related problems..
and if it is your phone(i assume you bought ur phone from tmobile) you should have a 1 year warranty. tmobile might exchange or call htc... all you really have to do is pay shipping.
Click to expand...
Click to collapse
Awesome, thanks for your help. I have had to replace my SIM card a couple of times as well with previous phones but that was due to MMS problems. I didnt think of 3G/SIM problems but I hope that is it. Thanks again!!
I went to the T-Mobile store today and they said that a lot of people have come in with the same problem. So apparently it is a problem with the 3G network here in Southern California (at least the area I live in). I am grateful it is not my phone or the ROM but still kinda ticked off I gotta deal with it until the issue is resolved...
bethel03 said:
I went to the T-Mobile store today and they said that a lot of people have come in with the same problem. So apparently it is a problem with the 3G network here in Southern California (at least the area I live in). I am grateful it is not my phone or the ROM but still kinda ticked off I gotta deal with it until the issue is resolved...
Click to expand...
Click to collapse
Ask them to reimburse you for the downtime
i too have been having the same problem as the original poster!
out of nowhere my 3g starts acting really funky and only the up arrow flases but it doesnt download anything. i hope this is a problem with the 3g network in los angeles otherwise idk what ima do.
djbootleg said:
i too have been having the same problem as the original poster!
out of nowhere my 3g starts acting really funky and only the up arrow flases but it doesnt download anything. i hope this is a problem with the 3g network in los angeles otherwise idk what ima do.
Click to expand...
Click to collapse
whenever this happens.. it usually means that ur in an area that has weak 3g. i.e. i get weak 3g service in my nearest mall.
or ur areas 3g network is bugging up. but most likely its the first one ^
im having the exact same problem. been having it for a week or so. i thought maybe it was a bug in cyans roms but its not. i will lose 3g connection but i have a full connection and only the uplink arrow is on. this is really pissing me off. i live in los angeles and its been having 3g for a while now and i have never experoenced issues like this with 3g

Atrix HD - Having intermittent signal loss using Straight Talk.

The wife and I have Atrix HD phones that we bought used but in great condition a couple months ago. We purchased the Straight Talk at&t compatible micro sim kits from walmart.com and set up our service. We previously had Samsung Captivates also on Straight Talk and they worked flawlessly. I put in my APN settings and I get data and MMS perfectly but occasionally I get a red triangle where my signal bars should be and my phone says "Emergency Calls Only" and I will wait 30 seconds or so and my signal returns. There is no steady decline in signal that leads up to this. It goes from like 4 bars to a red triangle with a cross inside it.
I live in a fair sized town and have always had 3 or more bars of at&t service with phones in the past so I do not think its an issue with poor coverage. I am attaching pictures of my APN settings.
Any help would be appreciated.
Applehater87 said:
The wife and I have Atrix HD phones that we bought used but in great condition a couple months ago. We purchased the Straight Talk at&t compatible micro sim kits from walmart.com and set up our service. We previously had Samsung Captivates also on Straight Talk and they worked flawlessly. I put in my APN settings and I get data and MMS perfectly but occasionally I get a red triangle where my signal bars should be and my phone says "Emergency Calls Only" and I will wait 30 seconds or so and my signal returns. There is no steady decline in signal that leads up to this. It goes from like 4 bars to a red triangle with a cross inside it.
I live in a fair sized town and have always had 3 or more bars of at&t service with phones in the past so I do not think its an issue with poor coverage. I am attaching pictures of my APN settings.
Any help would be appreciated.
Click to expand...
Click to collapse
I'm having the exact same issue since switching to to the 4G LTE micro sim. It only seems to happen on mine when I'm connected to Wifi though. I get the red triangle intermittently. This never happened to me until I went from the old sim to the new one. Can't find anything on it yet.
same thing
The same thing is happening to me here as well but using a Net10 LTE sim card (same as straight talk basically). I notice it the most after I complete a phone call. It takes a minute or two to regain service again. This is really annoying. Would like to see a solution to this problem.
So I worked with Straight Talk support for about 5 days, back and forth, bounced to several reps throughout and nothing substantial has come of it. It seems a little better after they made "adjustments" to my account as they put it, but I still get disconnected from mobile data when on wifi.
Don't get me wrong, their support people were very responsive and seemed to genuinely want to help me, but in the end they said "your ticket has been open for more than 24 hours so it has been closed. If you continue to have issues please open a new ticket." Anyone else have any luck on this?
I also was having this problem found that if you edit existing att apn (phone needs to be rooted)with sqlite editor it seems to work fine.
tether also works fine this way.I am still not able to get lte to work with straight talk even with new sim.
Just to follow up. As usual, it seems with ST support, one rep tells me they have some things they can try once I call back on another line and then I get a new rep who says nothing can be done until 10 people complain about the exact same issue I'm having. I'm assured this is an isolated incident...
I went ahead and purchased a new SIM card (looks different than the first LTE card I had) in case I had a faulty SIM. Worked flawlessly for a day and now it's back to the same issue of cutting out completely throughout the day.
same problem here on wifi get red triangle (especially after phone call).
More since i switched from 4g sim card to lte sim noticed that data disconnect from time to time like make impossible to watch video flawlessly...
with old 4g was yes only 4g but never loss a bite....could watch anything also streaming tv.....now it is impossible.....
the end of the month going to switch to old sim and see if the problem is in the new sim cards they tried may be to limit access or is in the new service doesn't matter what sim card you possess..
we'll see...
htchd2fix said:
same problem here on wifi get red triangle (especially after phone call).
More since i switched from 4g sim card to lte sim noticed that data disconnect from time to time like make impossible to watch video flawlessly...
with old 4g was yes only 4g but never loss a bite....could watch anything also streaming tv.....now it is impossible.....
the end of the month going to switch to old sim and see if the problem is in the new sim cards they tried may be to limit access or is in the new service doesn't matter what sim card you possess..
we'll see...
Click to expand...
Click to collapse
Switching to my old sim was my first thought to. However when I tried it didn't work. I called ST and they informed me that once you switch sims, the old one can never be reactivated. On top of that they don't offer the non LTE sims anymore. Such a pain. Hope you have better luck though.
pentjaksilat8 said:
Switching to my old sim was my first thought to. However when I tried it didn't work. I called ST and they informed me that once you switch sims, the old one can never be reactivated. On top of that they don't offer the non LTE sims anymore. Such a pain. Hope you have better luck though.
Click to expand...
Click to collapse
Some one could correct me if I'm wrong here but I'm pretty sure this is a result of ROMS using a 4.4 rom. Modem crashes. If you want to test it run a Stock ROM... If you are already using a completely stock ROM then Idk what to tell you. But same thing happens to me using any version besides stock. And yes only when on WiFi
metalmike6 said:
Some one could correct me if I'm wrong here but I'm pretty sure this is a result of ROMS using a 4.4 rom. Modem crashes. If you want to test it run a Stock ROM... If you are already using a completely stock ROM then Idk what to tell you. But same thing happens to me using any version besides stock. And yes only when on WiFi
Click to expand...
Click to collapse
I'm on a 100% stock ROM, I haven't unlocked my boot loader, just rooted.
pentjaksilat8 said:
I'm on a 100% stock ROM, I haven't unlocked my boot loader, just rooted.
Click to expand...
Click to collapse
Then unlock your bootloader and try flashing different radios from the different stock fastboots we have. Depending on the fastboot I can have next to none or almost full in my bedroom. For me, ATT JB is in the middle, JB Mex Retail is the best, Bell ICS is the worst. ATT ICS was about the same as ATT JB.
skeevydude said:
Then unlock your bootloader and try flashing different radios from the different stock fastboots we have. Depending on the fastboot I can have next to none or almost full in my bedroom. For me, ATT JB is in the middle, JB Mex Retail is the best, Bell ICS is the worst. ATT ICS was about the same as ATT JB.
Click to expand...
Click to collapse
For the time being, I just switched to Aio and so far so good with LTE coverage and no disconnecting issues. If they return I'll try different radios as you suggested.
So I've been with Aio for about a week now and everything is working great (knock on wood). I've had 2 mobile data drops at work with Wifi turned on, but they only lasted for a second and I do have really bad reception here inside the building. Outside of that no issues at all so far. I'll update if anything changes.

[Q] No service / No sim card

A. Introduction: I had the HTC Desire C working smooth and fine. Then one fine day, I realized that the microphone is not working properly, the person at the other side of phone call would not be able to listen to me unless I'd literally shout over phone. So I gave the phone to the HTC service center because it was under warranty. They changed some parts and handed back the phone to me. But the problem was still there. I again submitted my phone. They changed the same parts again and now the mic was working classic, phone was working smooth.
B. Twist in the scene: Just after few days, I was on my way to home after some work and I noticed that phone had a cross (x) against the signal and when I pulled down the notification thing, it said NO SERVICE. This used to happen a lot of times from then onward. Switching to Flight Mode and then reverting back (OR a restart OR a sim pullout and insert again) would sometimes fix the issue, but only temporarily. Sometimes after reboot, it would say NO SIM CARD, sometimes NO SERVICE and sometimes proper functioning with 2-3 bars.
C. Attempts from my end: I thought that they have messed the sim card slot while assembling my phone back and it is a hardware issue. But I was finding it hard to believe. I tried switching to GSM ONLY, then it would show full bars, but again only temporarily -- later NO SERVICE again.
The same SIM card in other phones (standard Nokia b&w phones aka hammers) shows full bars. And I have tried 3+ sim cards in the HTC, but all say NO SERVICE after sometime, maybe due to some activity (connecting internet) or just randomly on its wish.
I studied about radios(modems/baseband) and found that they are drivers and they also decide when and how to switch between 2G and 3G network etc.
D. Other Information and Background: Many times, when there is NO SERVICE error, when I check the Signal Strength it says -83dBm 15asu, so that is pretty hard to digest. The other times it says 0dBm 99asu, which should be obvious for a NO SERVICE error.
With point number E.2. in this post I have unlocked the bootloader and rooted my phone, installed CWM recovery, took a backup.
E. Options that are/aren't available from my perspective and my doubts:
1. Warranty period is over now, and I do not want to take my phone to the service center.
2. Can flashing a custom rom and radio fix this issue? If yes, direct me to some reliable ROMs for the same. CM10 build#3 (from here) didn't boot.
3. I have a Linux laptop, so options strictly based on Windows PC will not apply.
Has anyone faced similar issue? I found many pages with similar issue, but nowhere was the exact solution/troubleshoot mentioned.
I did have a problem with sim cards. What I tried doing is borrowing a friends sim card to see if it works on my phone. To my relief it worked and meant that my current one just died. So I went to one of the offices of my Phone plan providers and just changed it and it worked. If you can try that and give back results, it would be awesome.
Depending on the age of your SIM card can give those errors but as you stated you tried other SIMS and same occurred so my guess is it's either Hardware or Baseband Software, unless there's a Baseband update or simply reflash same Baseband, if it still persists I'd more suspect Hardware.
Bashing away at my HTC Desire C
me4488 said:
I did have a problem with sim cards. What I tried doing is borrowing a friends sim card to see if it works on my phone. To my relief it worked and meant that my current one just died. So I went to one of the offices of my Phone plan providers and just changed it and it worked. If you can try that and give back results, it would be awesome.
Click to expand...
Click to collapse
I, myself have a lot of sim cards to check this and I have already tried other sim cards. Some cards are not even recognized. Some are being recognized but it says NO SERVICE after sometime. Switching to Flight mode and back or restarting the phone or Going in Testing Mode > turning off radio > and turning it on again, sometimes solves the issue but only temporarily.
Antagonist42 said:
Depending on the age of your SIM card can give those errors but as you stated you tried other SIMS and same occurred so my guess is it's either Hardware or Baseband Software, unless there's a Baseband update or simply reflash same Baseband, if it still persists I'd more suspect Hardware.
Bashing away at my HTC Desire C
Click to expand...
Click to collapse
Probably. And that's why I installed mini CM10 and flashed the radio with the latest HTC Desire Radio (for CM), but it still says NO SERVICE and the same baseband version as it was saying with the stock ROM. :/
Even though the signal strength is -63dBm 25asu
Can you call or something if it is showing signal strength?
Sent from my HTC Desire C using XDA Premium 4 mobile app
rudi_j7 said:
Can you call or something if it is showing signal strength?
Click to expand...
Click to collapse
No, I wasn't able to call. And when I would search for a network it would say "Error while searching for networks"
I'm more likely to suspect the actual SIM card holder hardware and not the SIM Card itself or the Baseband (No errors reflashing and other SIM's no different than your own), the fact it's showing signal strengths but you're not getting onto the network suggests RADIO hardware is most likely working along with software but a hardware failure could just be 1 connection to the SIM
Q. Are all other SIM's working in other phones and does your SIM work in another phone?
If so I'd suspect the SIM Slot onwards.
Q. may or may not apply but possibly relevant, does Bluetooth and Wi-Fi still work?
Antagonist42 said:
I'm more likely to suspect the actual SIM card holder hardware and not the SIM Card itself or the Baseband (No errors reflashing and other SIM's no different than your own), the fact it's showing signal strengths but you're not getting onto the network suggests RADIO hardware is most likely working along with software but a hardware failure could just be 1 connection to the SIM
Q. Are all other SIM's working in other phones and does your SIM work in another phone?
If so I'd suspect the SIM Slot onwards.
Q. may or may not apply but possibly relevant, does Bluetooth and Wi-Fi still work?
Click to expand...
Click to collapse
Answer #1: Yes
Answer #2: Yes
Q. I still don't get that when I have flashed the radio, how is it still saying the same baseband version? Doesn't flashing a new radio change it?
Recent UPDATE: Somehow, the phone is behaving well... (always 3 bars or full 4 bars), after the mini CM flash and NOPE 750 flash. Initially it was NO SIM CARD or NO SERVICE but multiple reboots and pulling out and reinserting the sim card have made it this far. Let's see if this good behavior persists.
UPDATE: Back to the same state of disconnecting/No Service/No Sim Card
I still suspect the SIM slot as you could have disturbed what's known as a 'dry joint' essentially made it make contact until it disconnects again even with just a change in any kind of pressure (placing the cover on or placing it on a table).
Then again it could be down to ROM and Kernel, I wouldn't totally rule it out without going back to stock ROM and Kernel and seeing any change
Bashing away at my HTC Desire C
Antagonist42 said:
I still suspect the SIM slot as you could have disturbed what's known as a 'dry joint' essentially made it make contact until it disconnects again even with just a change in any kind of pressure (placing the cover on or placing it on a table).
Click to expand...
Click to collapse
Any DIYs to fix this?
Then again it could be down to ROM and Kernel, I wouldn't totally rule it out without going back to stock ROM and Kernel and seeing any change
Click to expand...
Click to collapse
That sucks!
UPDATE: The network seems quite reliable when I am on GSM only (2G only). That again indicates that somehow the problem lies in only the radio driver.
Any ideas?
Same Problem
I am facing exactly same problem on my HTC Desire C. Did lot of hard reset problem reappears after couple of days. got my phone reinstall OS at HTC service centre problem reappeared after a week.
Same sim is working fine in other phone, even got new sim still same problem.
Am confused if its hardware or software issue, problem comes only when phone is in GSM only mode, works fine on WCDMA only or AUTO mode.
But in WCDMA only since network is not good signals are low and in AUTO mode when signals are low it switches to GSM and if at that particular moment there is problem then NO SIGNALS.
Update, Phone fine. Help with the settings!
I checked a lot of sim cards and found that my phone is perfect! There is no hardware issue.
So I am presenting the present scenario. Please help!
I have 2 phones: HTC Desire C and a Nokia B&W aka hammer.
1. TATA DOCOMO sim card work fine on both phones.
2. AirTel sim card works fine in Nokia but HTC says "No Sim Card" regardless of the numerous attempts.
3. Reliance sim card (brand new, bought today) works fine in Nokia but HTC says "No Sim Card".
4. A friend's Reliance sim card was working fine in HTC.
If any Indian friend might help, then it would be great as this issue is more local specific I guess. Or any user who might have faced similar issue and then found a fix please help.
You tried Vodafone?
Sent from my HTC Desire C using XDA Premium 4 mobile app
rudi_j7 said:
You tried Vodafone?
Click to expand...
Click to collapse
Not yet.
And believe it or not, but the AirTel sim that I mentioned in my last post was working once I washed it with some alcohol. So it might indicate that the sim was old and dirty maybe.
But what about the new Reliance sim, I just bought it today and it works in Nokia. I'd have switched to Vodafone but I can't afford its high 3G plan rates as I have to maintain an MTS MBlaze for laptop as well.
And the thing that friend's Reliance sim works fine in my phone is troubling me even more.

[Q] N6 - No incoming & outgoing Calls, mobile data gone.

Having my Nexus 6 for almost a month. Things working perfectly in the starting(or after reset), but after two or three days, No incoming calls, no outgoing calls. No mobile data. Cant realy tell it as a mobile sometimes. Wifi is working good always. After reset, it is working properly for two or three days. Whenever it is not working, I am able to see a !-mark near the tower bar.
My mobile always connected to 4G when no wifi.
No Custom ROMS and no root. Plain Android given by google.
Anyone having this issue. Any suggestion?
Go get a new SIM.
Sent from my Nexus 6
I was begining to think i was the only one who had this problem!
Yesterday morning i woke up and to my suprise my signal bar had a (!) it it but it was still displaying my regual signal level.
I switched my wifi of and i couldnt get a data connection just the (!) sign. I got my girlfreind to give me a ring and see if a
call would go through which it didnt it just said that i was unavalible. I then desided that a reboot might sort the problem
but when i my phone booted back up i was presented with the holow triangle signal icon to say that i had to signal. I then
popped my simacard out thinking it could have just been a bit of dust on it. I gave it a little bit of a dust of and popped it back
into my phone and i was given the same no signal and emergency calls only yet it was picking up that there was a simcard inserted.
The day before i had flashed the alpha version of PA so my next thought was that this would be a ROM bug and went ahead and
flashed chroma which i was using prior to PA and i had had no issues with. Held my fingers crossed as it booted up but much to my
dismay i was greated with the same no signal problem but i went into the settings and searched for networks. Three was one of
the network it had picke dup so i tryed to reconnect to it but i got the toast to tell me i couldnt connectto the network and to
try again later. I checked the APN settings and it had automatically grabbed threes APN from the sim card so at this stage i was
completly baffled by them problem.
My next move was to try my sim in my girlfreinds phone and what do you know it worked a charm. As a last shot to check everything
was okay and i was upto date on my bills etc i gave three a ring and they told me there was nothing wrong with my sim and everything
was working as it should be and that it was a problem with my phone.
That brings me to the point i am at now completly baffled as to the problem and slightly angry at the 2 week old phone that had been working
perfectly up until now has suddnely desided to stop with no warning.
So you are not the only one and i expect their are more of us. I am going to flash the offical stock rom from google and see if that does the
trick but im not holding up much hope i feel like im going to have to contact google and find out where the problem lies.
New SIM which is working good in other mobiles
SilkyJohnson said:
Go get a new SIM.
Sent from my Nexus 6
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I got this as new nano SIM from the retailer and seems like working in all other mobiles except Nexus 6. Also I can see lot of people having the same issue with Sprint Provided in US. One more Victim replied too.
greatleo said:
I got this as new nano SIM from the retailer and seems like working in all other mobiles except Nexus 6. Also I can see lot of people having the same issue with Sprint Provided in US. One more Victim replied too.
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i reverted back to complete stock using the image from there site to no luck so i relocked the bootloader and took it back to the carphonewarehouse and they straight swapped it for a new one which is working perfectly
My sim died after a month. My calling went out and then only lte worked no 3g. Got card replaced and it works perfect now. I have US Cellular.
I've posted this in few other threads also, but I had also problem where I only had tgt exclamation mark no matter what I did. I solved the problem by waiting like 5sec before inputting my pin-code. If I input my pin code too fast after a boot, it will open my phone, but won't give me cellural network. This seems to happen in every ROM I've tried
Hi,
Solved the issue. Working fine after enabling request for SIM Pin and set my sim pin.
Usually i disable sim pin lock to have uninterrupted boot. But with ROM this is not working.
Enabling SIM pin request solves the issue.
Is this problem with carrier or Android L?
Sent from my Nexus 6 using XDA Free mobile app
greatleo said:
Hi,
Solved the issue. Working fine after enabling request for SIM Pin and set my sim pin.
Usually i disable sim pin lock to have uninterrupted boot. But with ROM this is not working.
Enabling SIM pin request solves the issue.
Is this problem with carrier or Android L?
Sent from my Nexus 6 using XDA Free mobile app
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Click to collapse
I have not seen this issue on three devices I've owned with Lollipop. So it appears to be a carrier issue?

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