How to activate VoLTE in iPhone

Recently Reliance has launch the Reliance Jio 4G which supports Voice Over Data(VoLTE). Now , to get maximum use of this VoLTE you need to activate this service on your iPhone.
To activate VoLTE follow the below:

• VoLTE is supported in iPhone 6, iPhone 6 Plus, iPhone 6S, iPhone 6S Plus, iPhone 7, iPhone 7 Plus. Here's how to enable the Voice over LTE.


• Some carriers turn on this features by default. To find our if VoLTE is on, go to Settings> Cellular> Cellular Data Options> Enable LTE. If Voice & Data is off, tap it to turn on VoLTE.