From the first time I ever use my phone, like 1-2 month ago, this feature (switch default mobile data) never got right. i think some update will solve it, but after several month my this popup "Failed to switch 4G/3G slot" always appear, I use my dual sim for different purpose of network.
at first installing my p30 pro, i restore my phone from xiaomi mi mix 2s direct from google, i ever think to factory reset and brandly new fresh p30 pro, but to restore it will consume so much setting and have to move several custom data in my phone.
i tried to search anywhere in google even this forum, no one thread that discuss this problem, is there any way to troubleshoot where or what to do? i just tried to restart and to swith my phone slot 1 to 2 and reverse, but none of them work, MY EMUI version 9.1.0, Build version 9.1.0.168 (CE301E14R2P2) that sold over lazada.id flash sale Indonesian market.
see my attachment,
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Bought the phone second hand last year as a temporary stop gap until new one arrived from China. Nitrogen had been installed by the previous owner - I have no experience of modding/installing new op sys.
All had been well up to yesterday when I noticed I was getting no signal, no texts no data etc. Checked with mobile operator who asked if I'd tried the sim in another phone and lo and behold it worked in my new phone
From my limited knowledge I think that if I reset the phone to factory settings, to see if that solves the problem, I'm going to get Xiaomi's OS instead when it restarts.
So where should I look for a new compatible version of Nitrogen and, if I download it, will it automatically replace the previous version and leave everything else intact or is it a case of wiping everything and starting again ?
Thanks in advance for any light you can shed ?
Hi dear friends,
I have a Chinese K20 Pro with unlcoked bootloader and running india firmware 10.3.5.0
Previously I had Huawei Mate 10 Pro working with VoLte flawlessly. but my K20 Pro VoLte option was not present in the menu so i searched a little bit and find following code to re enable the option *#*#86583#*#*
After enabling the volte, to be sure that if it really works, i tested avalablity of internet data when i was talking to someone and it was ok.
But from 2 days ago there were several(if not all the time) that when i got a call or when i call someone just seconds after connecting the connection dropped 4g volte icon disappears and mobile signals goes grey with cross icon on it and after just a seconds it turned on again, it was like i pulled out the sim and insert it again.
I have not any problem if i turn off volte option and i was almost sure that the problem is some incompability between my phone and operator volte but i tried something else too, i switched the sim from sim1 to sim2 and with volte on i don't have any problem so i got confused do i have hardware problem?
Any idea?
Same on me, Telenor Bulgaria.
Krasimir said:
Same on me, Telenor Bulgaria.
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Click to collapse
So it worked for you before but now you have the same problem as me? Or you always have the problem?
Also did you have the same situation with the sim slots?(one is ok another not ok)
Yes, it's working fine last week. I will try swaping cards. Maybe it's a software related, updated to last beta from xiaomi.eu on saturday. Problem arrived after that.
Krasimir said:
Yes, it's working fine last week. I will try swaping cards. Maybe it's a software related, updated to last beta from xiaomi.eu on saturday. Problem arrived after that.
Click to expand...
Click to collapse
Please swap the sim cards and test, it is almost 2 days that volte on sim 2 is working ok.
Edit 1: it is almost 4 days that i use my phone with volte ON using sim 2 no call drop no problem, can anybody confirm the same behaviour?
It was same with me, also Telenor Bulgaria.
I switched to sim 2 after reading here a few days ago and the problem seems to be resolved.
Before I had to restart the phone in about 2 days, because I just stopped hearing the person who calls me. Or switch to 3G. But to use VoLte again I had to restart. It just happened every other day...
Now everything seems to be fine... with that problem.
I still have the problem of not being able to use the Google Assistant to unlock my phone and can't turn on location history on Google maps.
I guess it's because of the Chinese ROM.
Anyway thanks for showing me a way to use VoLte less struggling
fankata said:
It was same with me, also Telenor Bulgaria.
I switched to sim 2 after reading here a few days ago and the problem seems to be resolved.
Before I had to restart the phone in about 2 days, because I just stopped hearing the person who calls me. Or switch to 3G. But to use VoLte again I had to restart. It just happened every other day...
Now everything seems to be fine... with that problem.
I still have the problem of not being able to use the Google Assistant to unlock my phone and can't turn on location history on Google maps.
I guess it's because of the Chinese ROM.
Anyway thanks for showing me a way to use VoLte less struggling
Click to expand...
Click to collapse
Glad that it helped, but it is strange problem
By the way i didn't use chinese rom, i am using indian rom which is almost the same as global rom but the device by default was from china and was running chinese rom, my theory is that devices came from china have some incompability with the bands or volte with other countries...
Volte disappearing and data & voice calls get disconnected.
I bought my k20 pro last month & last week all of a sudden volte got disconnected & appeared again.
Then after few moments my friend called me and all of a sudden call ended & I saw No network on the screen & after a few seconds volte was enabled again automatically.
At , First I thought it was just data or APN problem.
Then the things got worse when I was playing PUBG game and volte disappeared again and same thing happened again and again every 6 to 7 minutes .
I am frustrated of this , can you get me out of this mess , can you tell me what should I do to solve this issue
Thank you
Munyb said:
I bought my k20 pro last month & last week all of a sudden volte got disconnected & appeared again.
Then after few moments my friend called me and all of a sudden call ended & I saw No network on the screen & after a few seconds volte was enabled again automatically.
At , First I thought it was just data or APN problem.
Then the things got worse when I was playing PUBG game and volte disappeared again and same thing happened again and again every 6 to 7 minutes .
I am frustrated of this , can you get me out of this mess , can you tell me what should I do to solve this issue
Thank you
Click to expand...
Click to collapse
It seems nothing we can do about this, just disabling volte solves the problem.
My guess is that K20 Pro modem is optimized for China's cellphone towers so volte is not quite compatible with other countries. it is just my guess.
Hello everyone,
I just got my phone back from after sales service due to my phone been softbricked (black screen, device not charging when plugged, ...) and by phone can boot now but it's bugging as soon as i put a SIM CARD in it.
When putting the SIM CAR in, phone is loosing wifi connection every 60 seconds (approximately) even right beside the router, and for the network, i'm stuck in EDGE and no signal stability either.
It's the same SIM CARD that was in before i sent it for repair, so the issue should not come from it (and it's working fine on my old Mi5)
One change they did is that they've updated the rom to the last MIUI 12 EEA stable rom, it was still on MIUI 11 global when i've sent it.
I've already wiped it and installed again the last update but it didn't work.
I was wondering if the issue was not coming from the EEA rom instead of the global rom, but i'm unable to install it since i don't have a computer anymore that i can use for xiaomitoolV2 and since it's still under warranty i would like to avoid unlocking it.
Is this kind of issue known ? could it be only software issue ?
Thank you for your help.
I didn't install any specific app that could have modified the settings and no specific app or setup is usually required with my network provider.
vincentp82 said:
Hello everyone,
I just got my phone back from after sales service due to my phone been softbricked (black screen, device not charging when plugged, ...) and by phone can boot now but it's bugging as soon as i put a SIM CARD in it.
When putting the SIM CAR in, phone is loosing wifi connection every 60 seconds (approximately) even right beside the router, and for the network, i'm stuck in EDGE and no signal stability either.
It's the same SIM CARD that was in before i sent it for repair, so the issue should not come from it (and it's working fine on my old Mi5)
One change they did is that they've updated the rom to the last MIUI 12 EEA stable rom, it was still on MIUI 11 global when i've sent it.
I've already wiped it and installed again the last update but it didn't work.
I was wondering if the issue was not coming from the EEA rom instead of the global rom, but i'm unable to install it since i don't have a computer anymore that i can use for xiaomitoolV2 and since it's still under warranty i would like to avoid unlocking it.
Is this kind of issue known ? could it be only software issue ?
Thank you for your help.
Click to expand...
Click to collapse
More than likely it's going to be software issues. Did you already any apps top modify system settings?
Anyone else with network problems in some areas after Android 12? . In certain areas I my network drops, sometimes show me a good strength but when a call someone he answer and we can't hear each other. For calls works when he wants. Tried everything including Hard reset, Network reset, Clear cache, switching 5g/4g/3g/2g fresh install of official Samsung Rom via ODIN. Also did optimisation applications and nothing helps. I'm using s21 ultra, Exynos.I used my old iPhone Xs two days and works without any network issues. I go yesterday to my seller ( Saturn - A big technology shop) and they refuse to take me phone for repair/return because "They own the model too, they change the SIM card operator and nothing helps and it's a problem from this model, so they can't do anything" Can someone give me advice or some tips to try? I'm using the latest January update and can't go back to Android 11 rom because of new bootloader software...
I have it too. I have a good signal in big cities, but the village is a disaster. My past xiaomi was a good signal
ZPetrov said:
Anyone else with network problems in some areas after Android 12? . In certain areas I my network drops, sometimes show me a good strength but when a call someone he answer and we can't hear each other. For calls works when he wants. Tried everything including Hard reset, Network reset, Clear cache, switching 5g/4g/3g/2g fresh install of official Samsung Rom via ODIN. Also did optimisation applications and nothing helps. I'm using s21 ultra, Exynos.I used my old iPhone Xs two days and works without any network issues. I go yesterday to my seller ( Saturn - A big technology shop) and they refuse to take me phone for repair/return because "They own the model too, they change the SIM card operator and nothing helps and it's a problem from this model, so they can't do anything" Can someone give me advice or some tips to try? I'm using the latest January update and can't go back to Android 11 rom because of new bootloader software...
Click to expand...
Click to collapse
I think that's how Samsung phones have it. I compared it to an older Samsug and it was exactly the same
Ive got issues after installing BULF. It seems samsung messed up some security patch somewhere. Certain websites will not load on 5G or 4G+ Data, while it works on wifi and on tether to other devices. Funny thing is, if I switch it to 3G data, site loads fine.... Tried my sim on Note 10+ 5g running A11...Sites load & Works perfectly. Ive even factory reset to no avail, thinking it was some kind of glitch or somthing...
I have this in Ireland as well. Didn't have the phone on android 11 for long but the network signal now on 12 is definitely not good. Actual phone signal is bad not to mind 4g/5g. Any fixes?
Hi Everyone
I purchased a second hand s20 6 months ago and i am no longer getting any network carrier coverage.
I took my phone to local mobile repair shop and they identified that my base software was South Korean for some reason so they factory reinstalled Android 12 with UK Software. (This still does not work and they are stuck trying to solve the problem)
I'm fairly certain that this issue started when i upgraded from Android 11 to 12.
Please can anyone suggest a possible solution for my phone problem?
Things i have done so far:
1.) Factory reset phone several times including separate network resets.
2.) Tested my new replacement Virgin sim card in 2 other phones (This works)
3.) Tried several working sim cards in my s20 phone (None worked)
4.) Confirmed my phone is not barred or locked.
5.) Checked that i can see other Mobile network operators (Does not connect when i select my provider)
6.) Tested in other cities to confirm it's not a signal coverage issue.
7.) And finally, my phone has the latest Android 12 updates inc local app updates
Thank you
Just to add a further update, i have managed to get my phone working intermittently through WIFI but i still have an issue when outside my home.
LK2022 said:
Hi Everyone
I purchased a second hand s20 6 months ago and i am no longer getting any network carrier coverage.
I took my phone to local mobile repair shop and they identified that my base software was South Korean for some reason so they factory reinstalled Android 12 with UK Software. (This still does not work and they are stuck trying to solve the problem)
I'm fairly certain that this issue started when i upgraded from Android 11 to 12.
Please can anyone suggest a possible solution for my phone problem?
Things i have done so far:
1.) Factory reset phone several times including separate network resets.
2.) Tested my new replacement Virgin sim card in 2 other phones (This works)
3.) Tried several working sim cards in my s20 phone (None worked)
4.) Confirmed my phone is not barred or locked.
5.) Checked that i can see other Mobile network operators (Does not connect when i select my provider)
6.) Tested in other cities to confirm it's not a signal coverage issue.
7.) And finally, my phone has the latest Android 12 updates inc local app updates
Thank you
Click to expand...
Click to collapse
Your phone can be in the blacklist as some unpaid fees in the contract of origin provider you purchased this phone. I had exactly same problems and after pay all over due bills phone went into normal.
My S20 Ultra LTE keeps detecting a ghost SIM in the second SIM slot and is making my phone lost signal. Is there a way I can convert it from dual SIM to single SIM?