Bharat Sanchar Nigam Limited (BSNL) has extended its free SIM offer to January 31, 2021. It is valid for new customers as well as those who port over to BSNL, provided their first recharge coupon is for Rs. 100 or more.

source https://gadgets.ndtv.com/telecom/news/bsnl-free-sim-offer-extend-january-31-2021-pv-186-stv-199-plan-revised-bharat-sanchar-nigam-limited-2346031#rss-gadgets-all