Insert the Airtel SIM card into your phone
Restart the phone if needed
Ensure the SIM is properly placed and the phone has network signal
Complete any required SIM activation or KYC verification at the Airtel store or retailer
Wait for the activation SMS or call confirmation
Make a test call or send an SMS after activation
If the SIM is not activated, call Airtel customer care from another number
Visit the nearest Airtel store if activation is delayed or fails