How to enable VoLTE on BSNL to experience HD calls

Bharat Sanchar Nigam Limited (BSNL) is steadily expanding its 4G coverage across the country. It already has over 42,000 operational sites out of the planned 50,000. Compared to the 2G/3G network offered by BSNL, the 4G network comes with a host of improvements, including high-speed and low-latency wireless internet access, and voice-over LTE (VoLTE) calling support with superior and low-latency calling support.

If you are a BSNL user who makes frequent voice calls, then enabling VoLTE, given there is good 4G coverage, can help improve the call quality. While VoLTE is activated by default for some users, it needs to be manually activated in some cases.