The (Personal Unblocking Key) is a unique 8-digit security number designed to protect your SIM card from unauthorized use. If you enter your SIM's PIN incorrectly three times, your card will be automatically locked for security, and you will be prompted for this PUK code to restore access. Methods to Retrieve Your Airtel PUK Code
A PUK code is a unique linked specifically to your SIM card. It is required only after you have entered an incorrect SIM PIN three times , which automatically locks the card to prevent unauthorized access. How to Get Your Airtel PUK Code