DocShinde try inserting the sim in different phone… because as much as i know there are soooo many users complaining about airtel 5g network… airtel is not using standalone 5g so it’s causing issues… one you can try is…
Try 5g only mode and switch off smart 5g… You can do it by dialing *#*#4636#*#* >phone info>select slot (phone 0-1)>scroll down there will be a menu there will be NR/LTE selected change it to NR ONLY…
You can try this…if this works then fine and if it doesn’t work you can change it back from setting by changing 5g to 4g and back to 5g…
Airtel network in general causes network issues…and it’s monsoon so 5g network is very poor everywhere…