If you've entered the wrong PIN multiple times on your BSNL (Bharat Sanchar Nigam Limited) SIM card, it may get blocked, and you'll need the bsnl sim puk code (Personal Unlocking Key) code to unblock it. The PUK code is a security feature provided by the mobile service provider. Here's how you can get the PUK code for your BSNL SIM:

Check SIM Card Packaging:

The PUK code is often provided on the plastic card that your SIM card was attached to when you purchased it. Check the packaging or any documentation that came with your SIM card.
Contact BSNL Customer Care:

Dial BSNL customer care from another BSNL number (you can use a friend or family member's phone if needed).
The BSNL customer care representative will ask you for some details to verify your identity.
Once verified, they should provide you with the PUK code.
Visit a BSNL Store:

You can visit the nearest BSNL store or service center.
Present a valid ID and your SIM card to the staff.
Request assistance in retrieving your PUK code.
Online BSNL Portal:

You may also try logging into the BSNL online portal if you have registered for an account. Sometimes, PUK code information may be available there.
Remember not to enter an incorrect PUK code multiple times, as it might permanently block your SIM card. If none of the above options work, contacting BSNL customer support or visiting a BSNL store is your best course of action.

Please note that the process and specific USSD codes may vary by region, and my information might not be the latest. Always check with BSNL customer support or refer to their official documentation for accurate and up-to-date information.

USSD codes are generally used for accessing various services or information related to your mobile account, but retrieving the PUK code usually requires assistance from the carrier's customer service.

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

Contact BSNL Customer Support:

Dial the BSNL customer support number: 1503 or 1800-180-1503 from another BSNL number.
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 a BSNL Store:

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

Some mobile operators provide PUK information through their online portals or on the documentation that comes with the SIM card. Check BSNL's official website or any documentation you received with your SIM card.
Always use official channels to obtain the PUK code to ensure the security of your account. Contacting BSNL customer support is the most reliable way to get assistance with PUK-related issues.

For information on other services or account-related details, you can use general USSD codes provided by BSNL. These codes may vary by region, so it's advisable to check with BSNL or refer to their official documentation for accurate and up-to-date information.