The PUK code of Airtel is a security feature that restricts access to SIM cards by other users. It is also known as Personal Unblocking Number, and it is used to unlock a SIM card after you have locked it by attempting to enter the PIN three times. The PUK code is specific for each telecom operator, and Airtel has its own. It is usually written on the SIM card or on the SIM envelope that is provided while handing out the SIM card. Here are some ways to get the PUK code for Airtel:

• Via SMS: Use another Airtel mobile number to send an SMS with PUK><Space>15-digit SIM number to 121. Airtel will send you a new PUK code.
• Via USSD code: From another Airtel mobile number, dial 12151#, select the PUK option, enter your date of birth to verify your identity, and a new PUK code will be shown to you on the screen.
• Customer care: Call the Airtel customer care number and request the PUK code. You will be asked to provide a 15-digit SIM number printed on the backside of your SIM card. Once verified, you will be provided with a new PUK code.
• SIM body or certificate: Find the PUK printed on your SIM plastic body or certificate and type 05PUKnew pin*new pin# and press "Yes/Send/OK/Enter".
• Online: Some websites claim to provide PUK code for Airtel, but it is not recommended to use them as they may be fraudulent.

It is important to note that the PUK code is different from the PIN code, which is used to lock and unlock your phone. If you enter the wrong PUK code ten times, your SIM card will be permanently blocked, and you will need to get a new SIM card from Airtel.