Visit the nearest Airtel store or Airtel service center
Carry a valid government ID proof and the inactive SIM
Request SIM reactivation or SIM replacement if required
Complete any required verification or KYC process
Pay any applicable reactivation or replacement charges
Wait for the SIM to be reactivated by Airtel
Insert the SIM into your phone and restart the device
Check for network signal and make a test call or SMS
If the SIM is permanently deactivated, request a new SIM with the same number if eligible