For Airtel, if you need to retrieve your Airtel PUK code, consider the following steps:

Contact Airtel Customer Support:

Dial the Airtel customer support number. In India, you can call 121 or 198.
Follow the automated prompts or speak to a customer service representative.
Provide the necessary information to verify your identity.
Request the PUK code for your SIM card.
Visit an Airtel Store:

Go to the nearest Airtel store or service center.
Present a valid ID and your Airtel SIM card to the staff.
Request assistance in retrieving your PUK code.
Check Airtel Website or Documentation:

Some mobile operators provide PUK information through their online portals or on the documentation that comes with the SIM card. Check Airtel's official website or any documentation you received with your SIM card.
For information on other services or account-related details, you can use general USSD codes provided by Airtel. These codes may vary by region, so it's advisable to check with Airtel or refer to their official documentation for accurate and up-to-date information.