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A SIM typically deactivates if it has no usage (calls, SMS, or data) or a low balance for over .

Enter the OTP received on the alternate number to access the dashboard .

If your SIM is asking for a PUK code, do guess. Entering it incorrectly 10 times will permanently destroy the SIM card . Via Airtel Website :

To unblock an Airtel SIM online, the method you use depends on why the SIM was blocked—either due to a from entering the wrong PIN or deactivation from long-term inactivity . 1. Unblocking a PUK-Locked SIM