No BSNL 4G in Chennai but I've used BSNL 4G and VoLTE in KA and AP I found BSNL to BSNL VoLTE Codec (AMR-WB 23K) is better than Airtel and Jio's (AMR-WB 16K).
I don't have City list but While travelling from Chennai to Mumbai in train I got full BSNL 4G in train route after entering Karnataka Circle in 2020 Jan. I guess it's not started in Cities
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