Insert the new Airtel SIM into your phone
Restart the phone if needed
Ensure the phone has network signal
Complete any required SIM registration or KYC process
Wait for the SIM activation SMS
Call any outgoing number or Airtel customer care if activation is required
For prepaid SIMs, recharge if needed
For postpaid SIMs, verify plan activation
If the SIM does not activate within the expected time, contact Airtel customer support
Visit the nearest Airtel store if manual activation is required