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volte problem in airtel

Star I
so i just got a new airtel sim . After activation their was no option of volte for the sim and volte wasnt showing in notification tray. After some days i used this airtel sim in another zenfone max pro and it was showing volte and then i swapped another airtel sim into my phone and volte was working.
But then i inserted my airtel sim again and volte option wasnt present in settings option neither it was showing volte.
so whenever i make calls the sim gets to 2g network
please help
Please tell us some basic information before asking for help:

Model Name:zenfone max pro m1
Firmware Version: latest
Rooted or not:no
Frequency of Occurrence:
APP Name & APP Version (If your issue relates to the app):
In addition to information above, please also provide as much details as you can, e.g., using scenario, what troubleshooting you've already done, screenshot, etc.


Rising Star II
It's probably the issue with SIM, check with your network provider. Also, check whether your device is updated with latest firmware version.

Star I
but when i put the sim in another phone its working volte

Reset your phone and problem will be solved. I have already faced this issue with Airtel 4g sim.

Zen Master III
Hi, we'd request you follow the below steps:
1. Check your phone for latest software version.
2. Clear system cache.
3. Try the same under safe mode:
Hold the power button for 5 seconds => When the screen flashes with option => Press & hold power option => You will get an option to restart in safe mode
4. If still you face the issue factory reset your phone after taking a full backup: