BSNL SIM lost? How to block BSNL prepaid and postpaid mobile number and get a new duplicate SIM card

In case you have lost your phone with your BSNL SIM in it and it was your primary number, you know how difficult it gets. Since your mobile number is your connection with everyone and also your banking tool, it gets very risky once you lose it. While telcos like Vi and Jio have easy protocols in place for blocking a lost SIM, BSNL will require a bit more effort.

Also read: BSNL number check: how to check BSNL mobile number using USSD code and online

BSNL customers who have lost their SIM card can get it blocked either through email, customer care number, or visiting the nearest BSNL CSC. The last method is the best here since users can immediately apply for a duplicate SIM, which has to be done in any case if you block through email or customer care. Let’s take a look at all methods.

How to block BSNL SIM through email?


BSNL users can block their SIM through email, call, and customer service centers

Unfortunately, BSNL doesn’t have an online SIM blocking service yet. However, you can still get your SIM blocked using email. Follow the steps below to get your BSNL SIM blocked using email.

  1. Open your email app and compose a new mail
  2. In the recipient field, type
  3. In the subject line, type Block My BSNL SIM
  4. State the reason to block your BSNL SIM in the email body
  5. Also provide details like your name, date of birth, address, last call, and recharge details
  6. Attach PDF of all documents required as proof that you own the SIM
  7. Send the mail
  8. Wait for an update

Also read: BSNL validity extension recharge plans and offers

How to block BSNL SIM through customer care?

This is the easiest way to get your SIM blocked when it comes to BSNL. All you have to do is to dial the customer care number and answer several verification questions to get your SIM blocked. Below are the steps to do so.

  1. Open the Phone app on your device
  2. If you’re on the BSNL network, dial 1503
  3. If you’re on a non-BSNL network, dial 1800 345 1500
  4. Follow the instructions and press the appropriate number to talk to the customer care executive
  5. Request to block the lost BSNL SIM
  6. Provide details like name, date of birth, address, last five calls, and others as asked
  7. Your BSNL SIM will now be blocked

How to block BSNL SIM through Customer Service Center?

If you prefer to do things in person, you can walk into a BSNL customer service centre to get your SIM blocked.

  1. Visit the nearest BSNL CSC or retailer to you
  2. Carry the documents you provided at the time of purchasing the SIM
  3. Request the center operate to block the lost BSNL SIM
  4. Provide details like name, date of birth, address, last five calls, and others as asked
  5. Submit the ID proofs
  6. Your SIM will be blocked and you can apply for a duplicate BSNL SIM right away

Also read: BSNL 4G: how to get a new BSNL 4G SIM, upgrade 3G to 4G, activation process

How to get BSNL replacement SIM?

After you request BSNL to block your lost SIM, the telco deactivates the SIM card temporarily for a few days before completely blocking the number. The number of days will be mentioned in the SMS you received after submitting your request to block the SIM. You’ll need to apply for the replacement SIM within that time period, otherwise it will not be possible. Follow the steps below to apply for a BSNL duplicate number.

  1. Visit the nearest BSNL CSC or retailer
  2. Carry your ID and address proof
  3. Apple for the SIM replacement
  4. Provide details SMS, mail or receipt to show that the SIM has been blocked
  5. Your BSNL number will now be unblocked and a new SIM will be provided
  6. Insert the new BSNL SIM in your phone and complete the tele verification
Abhiman Biswas

Abhiman has over 8 years of experience in content development. He is a Senior Writer and Social Media Manager at Pricebaba. He covers technology news, feature articles, and tech reviews, apart from managing the official Facebook and Instagram handles. Despite a degree in marketing, his love for latest gadgets and technology steered him towards consumer technology coverage.