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Mobile network not working for MI5 - Critical

Hi MI5 community,
I am unable to use mobile network flawlessly in my MI5. Sometimes SIM1 running, SIM1+SIM2 both running, none of SIM card works. 2 weeks back I mistakenly selected the radio band as USA Band from *#*#4636#*#* -> Phone information1. Then after a fresh flashboot ROM installed problem solved automatically, but ideally this should not be. But now I am having terrible issue with SIM1 and SIM2 signal reception. Finally I have successfully write NV Values which was originally. But even after setting up values to the original, I am not getting mobile network signal. If I put only one SIM card then status bar says No Signal. If I put both SIM then 1st one says No Signal and 2nd one says Emergency calls only. Sometimes randomly SIM1 runs but SIM2 not. sometimes both not, sometimes both. Frustrating experience ever. Would appreciate if anyone can help me.
Looking forward some help from @TheUltrametricSpace especially.

I don't know whether i can help or not but i used to have mobile network fluctuating issue. At the same area, my SIM1 AND 2 will goes from 5 bar to 0, then came back to 3, then back to 0 then back to 5 again. It happen countless of times during the day(or even night). But the problem fixed when i switched to xiaomi.eu rom for mi5. I did do clean wipe system, data via twrp before i switched to xiaomi.eu rom.
Hope that helped

Hi @yChoon
Thanks for adding some views. Yesterday full day I was in latest EU ROM and the whole day I couldn't able to receive any signal. But around 8PM I have received signal @sim1 only. I hope I will be able to find out the culprit someday. But completely clueless

Read this : http://forum.xda-developers.com/mi-5/development/xiaomi-mi5-qualcomm-diagnostic-drivers-t3336200

That is why i tagged him. But he is not responding

Check this : http://en.miui.com/thread-277708-1-1.html

No success

:/ sorry i couldn't help you then. i fixed that problem by my own step above.. if it can't help you, at least i hope it could help other people

Hello @yChoon
I'm having the same issue as you with my Mi5. Did you ever experienced those issues again?

Can make phone calls only on 2g.

Hey guys, i'll start off by saying this is my first post, so go easy on me.
I'm currently running the oxygen OS pie beta 2 on my Oneplus 3T.
A couple of months ago, I had this weird problem pop up. People suddenly couldn't call me. And when I made calls, they say they can't hear me clearly at first and then after about 15 seconds, they can't hear me at all. The surprising thing is, I can hear them clearly on my side. I tried searching for solutions to fix microphone problems but that wasn't it. I thought it was SIM card problem and changed my sim. But the problem persisted. Then I wen't on to change to another carrier, which didn't solve the problem as well. I tried flashing havocOS thinking it might be a problem with oxygenOS, but still, same problem. By now I already know that it's a problem with the phone.
And then I tried switching the network to 2g only and viola. I could make and receive calls. However, data is super slow on EDGE (as expected). So after some time, I tried using 2g/3g automatic as the network setting (hoping the problem would have miraculously gone away). This time, the phone still couldn't make calls but it also got really hot. Sometimes to the point where it's too hot to touch the phone for long (no joke). So I immediately switched back to 2g only. I also tried 2g/3g/4g automatic and this allows me to connect to lte and the phone doesn't get hot but since my carrier has no VoLTE, I still can't make calls as the phone has to drop to 3g for calls. The phone takes a really long time to drop down to 3g and when it does, the calls still don't work and the phone gets hot.
So now i'm stuck on 2g only because I need to make and receive calls but data is just too slow to use. I hope I've given enough information. Any solutions?

Don't have a solution, but just a couple thoughts (shots in the dark, really):
1) What country are you located/what carrier do you use?
2) Does turning WiFi off make any difference? May not make a difference on this device, but I vaguely remember a while back someone having a problem with another device (and maybe a carrier specific issue) not dropping down to 2G for voice calls, and I think it only happened when WiFi was on.

redpoint73 said:
Don't have a solution, but just a couple thoughts (shots in the dark, really):
1) What country are you located/what carrier do you use?
2) Does turning WiFi off make any difference? May not make a difference on this device, but I vaguely remember a while back someone having a problem with another device (and maybe a carrier specific issue) not dropping down to 2G for voice calls, and I think it only happened when WiFi was on.
Click to expand...
Click to collapse
I'm from Malaysia and i'm pretty sure it's not a carrier problem. My sim works on my friends phone perfectly.
Nope, wifi didn't make a differene unfortunately.

Xiaomi mi 9T Pro - Problems receiving calls while on 4G

Hello!
I hope someone can help me with this "little" problem that I'm experimenting with my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) I checked everything before buying and the phone is fully compatible with my carrier (I'm from Venezuela), however, I noticed that when the phone is on 4G it switches to 3G/H/H+ in order to make/receive calls (which is pretty normal since my carrier does not support VoLTE). The problem comes when there is an incoming call, it should switch automatically to 3G/H/H+ BUT it does not happen all the time, in fact, I can say that it only happens 25% of the time when I was testing, of course, when it does not happen there is no way to receive the incoming call.
So far I tried:
- Forcing the phone to stay on 3G (everything works great)
- Testing the different network options (it switches from 4G to 3G but not always as it should)
- Switching from SIM slot 1 to slot 2
- At the moment the preferred network type is LTE/TD-SCDMA/UMTS (default)
Could it be a software issue? or could it be related to my carrier? I haven't tried using a SIM card from another carrier.
After all, I bought a PHONE that does not behave like an actual phone all the time, so, I hope someone can help me with this.
Thanks in advance.

Thank you, I almost thought I was the only one.
I bought my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) a week ago and I have the same symptoms like you.
Im on A1 Network in Austria running default network settings and I realized after hours I couldn't make calls (and obviously did't receive any).
This is the first phone I had this network problems, and I am on A1 network for 20 years with different phones....
I hope someone can share some light why this happens and what are the best settings for European (Austrian) A1 network.
Trying to switch to LTE/UMTS, but that setting is always reset to the default above after reboot.
As its also my work phone it would be very bad not recognizing for hours that I'm not reachable...
Thank you !

A1 supports VoLTE, try to enable it on your phone, I have no issues running a dual SIM config with A1 and 3 .....

pietropizzi said:
Thank you, I almost thought I was the only one.
I bought my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) a week ago and I have the same symptoms like you.
Im on A1 Network in Austria running default network settings and I realized after hours I couldn't make calls (and obviously did't receive any).
This is the first phone I had this network problems, and I am on A1 network for 20 years with different phones....
I hope someone can share some light why this happens and what are the best settings for European (Austrian) A1 network.
Trying to switch to LTE/UMTS, but that setting is always reset to the default above after reboot.
As its also my work phone it would be very bad not recognizing for hours that I'm not reachable...
Thank you !
Click to expand...
Click to collapse
Hi! It feels better knowing that I'm not alone.
The fact is that I can actually make calls (it take from 3 to 5 seconds switching from 4G to 3G/H), the problem comes when there is an incoming call, sometimes it works (it switches to 3G/H and when the call is ended, it switches back to 4G) but most it does not. I just tried LTE/UMTS and it does work but not for long, I can see that it happens and sometimes it does not. I found a "solution" which involves forcing to 3G/H but it's not the point, there should be a real solution. At this moment, I haven't found a correct network configuration, all the ones that I've tried just have worked for me for some time, and then the problem is back without even rebooting the phone. Could it be caused by a faulty SIM or it's just a network/carrier issue? I don't want to think that it's a hardware issue.

error23 said:
A1 supports VoLTE, try to enable it on your phone, I have no issues running a dual SIM config with A1 and 3 .....
Click to expand...
Click to collapse
Whats your ROM Version ?
I alreaddy tried to enable VoLTE, I can switch it on and the VoLTE Symbol appears.
The problem is - I have no caller ID. I don't even see the phone number when someone calls me ("unbekannter Anrufer" - "unknown caller")
That's not conveniant, so as soon as I switched OFF VoLTE caller recognition was enabled again.
Is VoWIFI working at you with A1 ? I can enable it but I don't get the symbot at home in my WIFI network.
So for now I see two options:
- the correct (stable) network configuration for Austria that persist in the phone configuration
- enabling VoLTE but with a solution for a working caller ID

I finally got found the solution
Problem is the notification settings.
This was somehow reset after the update to mui 11.
To fix the issue:
1. Go to settings
2. Click notification
3. Click the notification badges (3rd icon)
4. Find the "phone" icon
5. Enable the show notification
6. Exit to settings and test

Having same problem
Can someone help me I am from Malta and have Xiaomi mi9t pro and from last night stopped receiving calls and incoming . Tried with sim 1 and it worked but it happened again . I tried the notification settings but still the same problem .

I had trouble not receiving calls also...
After looking here, and also on YouTube, I started going through my phone again. I too was not getting my calls a lot, but I have only had my phone maybe 2 weeks, so there's not much on it yet. One thing I am always adding is themes. The theme feature is it's own pre installed app as I'm sure we've all seen. Different one's have been doing/blocking certain features at times on my phone. My husband's calls were being sent to voicemail, and some other important calls. I noticed the other day when I tried a new theme it locked me out of my phone with no preface to get back to the lock screen. I had to take a picture and select send to get back to the lock screen. Remembering this, I decided to go back to the original developer theme for the phone. My phone now rings. Original developer mode also controls the call feature, not just the theme, which I did not know or read until now. Going back to it I believe kind of reset my configuration. I would say give this a try for sure. Hope it helps someone else I love my phone and didn't want to lose it. FYI, I am on TMobile network in the USA.

Hi!
I have a very similar problem on a xiaomi redmi note 8t. I tried various settings, but failed. This is annoying because the phone is relatively new. I think it is a hardware problem.

Saulor said:
Hello!
I hope someone can help me with this "little" problem that I'm experimenting with my Xiaomi mi 9T Pro running MIUI Global 10.3.3.0 (Stock) I checked everything before buying and the phone is fully compatible with my carrier (I'm from Venezuela), however, I noticed that when the phone is on 4G it switches to 3G/H/H+ in order to make/receive calls (which is pretty normal since my carrier does not support VoLTE). The problem comes when there is an incoming call, it should switch automatically to 3G/H/H+ BUT it does not happen all the time, in fact, I can say that it only happens 25% of the time when I was testing, of course, when it does not happen there is no way to receive the incoming call.
So far I tried:
- Forcing the phone to stay on 3G (everything works great)
- Testing the different network options (it switches from 4G to 3G but not always as it should)
- Switching from SIM slot 1 to slot 2
- At the moment the preferred network type is LTE/TD-SCDMA/UMTS (default)
Could it be a software issue? or could it be related to my carrier? I haven't tried using a SIM card from another carrier.
After all, I bought a PHONE that does not behave like an actual phone all the time, so, I hope someone can help me with this.
Thanks in advance.
Click to expand...
Click to collapse
I have the same issue here in same phone but on EU MIUI 12.0.3.0 .. with the same symptoms u described .. i suspected in sim card and i replaced it with a new one and the issue still there .. did u find a solution for this issue?

I'm not sure if this is the same issue as what's described by OP, but it's somewhat similar (not receiving calls). Sometimes my colleagues will call me on Whatsapp and state that they're unable to reach me via the cellular network. This is what fixed it for me:
Settings - SIM cards & mobile networks - Select your sim card - turn off 'use volte (use volte to improve the quality of voice calls)'

scarmage said:
I'm not sure if this is the same issue as what's described by OP, but it's somewhat similar (not receiving calls). Sometimes my colleagues will call me on Whatsapp and state that they're unable to reach me via the cellular network. This is what fixed it for me:
Settings - SIM cards & mobile networks - Select your sim card - turn off 'use volte (use volte to improve the quality of voice calls)'
Click to expand...
Click to collapse
I tried this option and also not working the issue still there since 10 daysi also tried
Settings all specs then internal storage then sim 1 then change the setting to gsm only
After that the line working for 10 min and then again i can't receive calls or make ones

I have the same problem i have a redmi note 9 pro, i can't receive calls in 4G, i only can receive calls in Edge someone could resolve this? I tried all of these methods but nothing works

Question DATA ISSUES WITH MI 11 ULTRA (TMOBILE US) PLEASE HELP

Hey guys, bought a Mi 11 Ultra (Global ROM) off Giztop and plugged my T-Mobile sim into it and have almost no data at all times. Occasionally it will get data and I will get a message through or load a Youtube video but it seems very rare. While driving for long periods of time I will be on call with someone and it seems like every 4-6 minutes I lose service and the call drops. I am currently lost, have reflashed the modem, etc. I was wondering there was any APN setting fixes or something in developer settings that I may have missed. I am completely new to this phone so please throw the kitchen sink at me..
THANKS.

It seems strange because I have TMobile as well and my phone gets better reception than TMobile phone. Check your MIUI version your APN make sure is in T mobile fast and turn off 5G

I have the same phone from Giztop chineese version on T-moble and I'm having the same connection issues with this device i have to keep rebbot the phone to LTE or 5G to connect is it the rom version number is
miui 12.5.20

I had issues with CN MIUI version. I was on a video call and was dropping often. I switched to Global version and its been working since then.

Question Big issue, No Data during a call.

So One thing I discovered on this new phone of mine is that although working perfectly there is a major flaw in the way Internet data works during a phone call.
Any time you make a call, the phone downgrades the active signal from 5G/4G to H or E ( GSM).
Which in turns cuts off the data.
If I force 5G or 4G, then the phone call cannot be made. It just disconnects.
I have tried all settings, Volte enable/disable with no joy.
Some have said it's a carrier limitation, but it's not, cause in my iPhone, the very same simcard works just fine and the Internet is usable during a call.
Also tried with dual Simcard setup. As in the settings, the phone allows to use one simcard for data and one for call. Still not working.
Can someone please tell me if there is a solution please, or can you try your phone while on the call to see if Internet works as this feature is detrimental to me keeping the phone. If this doesn't work I will be selling the phone and getting a realme replacement.. Xiaomis sometimes suck with their non existent support.
Thanks

Evo400 said:
So One thing I discovered on this new phone of mine is that although working perfectly there is a major flaw in the way Internet data works during a phone call.
Any time you make a call, the phone downgrades the active signal from 5G/4G to H or E ( GSM).
Which in turns cuts off the data.
If I force 5G or 4G, then the phone call cannot be made. It just disconnects.
I have tried all settings, Volte enable/disable with no joy.
Some have said it's a carrier limitation, but it's not, cause in my iPhone, the very same simcard works just fine and the Internet is usable during a call.
Also tried with dual Simcard setup. As in the settings, the phone allows to use one simcard for data and one for call. Still not working.
Can someone please tell me if there is a solution please, or can you try your phone while on the call to see if Internet works as this feature is detrimental to me keeping the phone. If this doesn't work I will be selling the phone and getting a realme replacement.. Xiaomis sometimes suck with their non existent support.
Thanks
Click to expand...
Click to collapse
This comes from the operator who has not yet communicated with Xiaomi.
Same case with 2 operators on the same phone.
What version of rom?

NOSS8 said:
This comes from the operator who has not yet communicated with Xiaomi.
Same case with 2 operators on the same phone.
What version of rom?
Click to expand...
Click to collapse
Global ROM 13.0.4
I can't see an operator fault if they have Volte services enabled and this simcard works flawlessly on other android systems.
As a matter of fact, any SimCard i have tried, so far 3 providers and the phone does the same thing. As soonest the call is made it downgrades the signal to H while full 5G or 4G is available??

Evo400 said:
Global ROM 13.0.4
I can't see an operator fault if they have Volte services enabled and this simcard works flawlessly on other android systems.
As a matter of fact, any SimCard i have tried, so far 3 providers and the phone does the same thing. As soonest the call is made it downgrades the signal to H while full 5G or 4G is available??
Click to expand...
Click to collapse
the operator must provide the necessary information for each brand and phone to activate Volte and Wowifi.
On my 11t pro everything works with SFR and nothing with FREE because Free has not yet transmitted the information necessary to activate the services.

So went to see the operator. They sell Xiaomi phones. 3 network ( Three EU)
The phones in the stores are working just fine, no issues at all. And my phone simply just isnt.I have tried every possible setting and still not working.
See the screenshot below. As I'm typing this I'm on a super fast full signal 5G connection. As soon as I make a phone call, the phone will downgrade to E or H+ which is horrible. This network signal switching is also laggy, and If 2g signal is poor I cannot even make a call.

Evo400 said:
So went to see the operator. They sell Xiaomi phones. 3 network ( Three EU)
The phones in the stores are working just fine, no issues at all. And my phone simply just isnt.I have tried every possible setting and still not working.
See the screenshot below. As I'm typing this I'm on a super fast full signal 5G connection. As soon as I make a phone call, the phone will downgrade to E or H+ which is horrible. This network signal switching is also laggy, and If 2g signal is poor I cannot even make a call.
Click to expand...
Click to collapse
Does the "Use VoLTE" switch appear in the SIM card settings?
If not you can try the Dialer Code *#*#869434#*#*. That only will make this switch appear, but sometimes this is enough. It should also show the little VoLTE-Badge next to the signal strength (see screenshot).

Deleted

I just had another look and on your 1st post it says the SIM is named "3 IRL", as far as I know Three Ireland does not offer VoLTE at all.
So it will always drop to 3G/H+ or 2G/E ... on every phone.

mici01 said:
I just had another look and on your 1st post it says the SIM is named "3 IRL", as far as I know Three Ireland does not offer VoLTE at all.
So it will always drop to 3G/H+ or 2G/E ... on every phone.
Click to expand...
Click to collapse
5G connection should support this naturally. If I put this simcard Into an iPhone or Galaxy the 5G connection stays on regardless.
Anyway even with Vodafone this doesn't work,so I'm thinking it either a phone limitation or a phone is fooked

Evo400 said:
5G connection should support this naturally. If I put this simcard Into an iPhone or Galaxy the 5G connection stays on regardless.
Anyway even with Vodafone this doesn't work,so I'm thinking it either a phone limitation or a phone is fooked
Click to expand...
Click to collapse
No, for VoNR your phone still needs the same configs as with VoLTE. Though only a few operators support VoNR as of now.