Dial on your phone *#*#4636#*#* select network mode NR only, your problem will be fix.If code not working then use google dialer.If your problem will solved then accept this solution on the right side 3 dots.
Call Airtel Customer care they will activate 5g service on your device. Sometimes it goes auto de-activateEither dial *#*#4636#*#* select network mode NR only.Problem will be Fix
