Learn how users with BSNL 4G or 5G SIM cards can activate this VoLTE feature. Send a message to 53733 with the text ACTVOLTE. VoLTE will be activated on your phone once you send the message.

I say some phone calls above because VoLTE, or HD Voice, is not a consistent, standard feature yet, despite the fact that AT&T, Verizon, and T-Mobile started rolling out VoLTE services in 2014. AT ...