Please tell us some basic information before asking for help:
Model Name: Asus zenfone max ZC550KL (2016)
Firmware Version: WW_188.8.131.52_20180123
Rooted or not: not
Frequency of Occurrence: Always
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.
Asus zenfone max ZC550KL (2016) not showing VOLTE toggle option for airtel sim but VOLTE options shows when using JIO sim in the same device. Cant figure out what the actual problem is with my Asus zenfone max ZC550KL (2016) ?