First 4G BTS is launched in Ballygunge exchange. Mass scale 4G launch in Kolkata telecom circle would take another month, while BSNL would take 4G to atleast 50 cities of Bengal circle in next 2 months. PSU telco expects to provide full 4G coverage across the state within a year.
Eastern circles got BSNL 4G quite late while south, central, north and west zones already got 4G. However till date no zone has patch-less, smooth 4G coverage from BSNL. BSNL has invested Rs 1079 crore in Kolkata & Bengal circle to roll out 4G.
BSNL 4G will use spectrum across 700, 2100 and 2500 MHz band. Presently Jio, Airtel and Vodafone's 4G uses 800, 900, 1800, 2100, 2300 and 2500 MHz band. Apart from BSNL's 4G-LTE on 700 MHz, all other bands are compatible with existing smartphones. I guess that could be done easily by an OTA update to smartphones.
