Insert the Airtel SIM into your phone
Restart the phone if needed
Ensure the SIM is properly inserted and the device has network signal
Complete any required SIM registration or KYC process
Wait for the activation SMS or call from Airtel
If the SIM is new, make an outgoing call or send an SMS after activation is confirmed
For prepaid SIMs, recharge if required
For 4G/5G SIM replacement, follow the SIM swap instructions provided by Airtel
If activation does not happen, contact Airtel customer care or visit an Airtel store