Visit the nearest Airtel store or Airtel service center
Carry a valid ID proof and your Airtel postpaid SIM
Request a postpaid to prepaid conversion
Fill out the required conversion form
Pay any pending postpaid bill dues
Choose a prepaid plan or recharge pack
Complete the verification process if asked
Wait for the SIM conversion to be processed
Restart your phone after the conversion is completed
Use the same number on the new prepaid connection