volte not support

[kavi13]

I bought mobile in qatar now am using in india volte settings not support

[BasimSulthan · Accepted solution]

cause Indias frequency bands are different
and Indian sims support volte only if phone is having Indian firmware

only option is flash Indian firmware on your device and volte will work

[Viggyversion]

How do I "flash Indian firmware" on my device? I have Samsung M20.