As digital transactions become more common, cybercriminals are constantly finding new ways to target unsuspecting users. From fake calls and phishing messages to SIM swap scams, fraudsters are using increasingly sophisticated techniques to gain access to personal information and financial accounts.

Security experts warn that one of the most overlooked risks occurs when people apply for a new SIM card. Sharing sensitive details such as One-Time Passwords (OTPs) or biometric information with unauthorized individuals can expose users to serious financial and identity-related fraud.

Here's what every mobile user should know before purchasing or activating a new SIM card.

Why SIM-Related Fraud Is Increasing

Mobile numbers have become closely linked to banking services, digital wallets, social media accounts, and online verification systems. As a result, gaining control of someone's mobile number can provide cybercriminals with access to a significant amount of personal information.

Fraudsters often exploit the SIM issuance or replacement process to carry out scams such as:

• SIM swap fraud

• Identity theft

• Unauthorized banking transactions

• Mobile wallet fraud

• Social media account takeovers

• Financial scams using stolen identities

Even a small mistake during SIM registration can create opportunities for criminals to misuse your information.

What Is a SIM Swap Scam?

A SIM swap scam occurs when a fraudster obtains a duplicate SIM card using someone else's identity details.

Once the duplicate SIM becomes active, the criminal may receive:

• OTPs from banks

• Account verification codes

• Password reset messages

• Mobile banking alerts

This access can allow scammers to take control of bank accounts, digital payment platforms, and other sensitive online services.

In many cases, victims only realize something is wrong when their original SIM suddenly stops working.

Never Share Your OTP

One of the most important safety rules is to never disclose your OTP to anyone.

Even if someone claims to be:

• A telecom company employee

• A customer support executive

• A SIM activation agent

• A bank representative

You should never share an OTP received on your phone.

Telecom companies generally do not require customers to verbally disclose OTPs to retailers or agents during normal SIM registration processes.

If someone asks for your OTP, treat it as a warning sign and verify the request directly with the service provider.

Be Careful With Biometric Verification

Biometric verification, such as thumb impressions or fingerprint authentication, is commonly used during SIM registration and identity verification.

While biometric authentication is secure when handled properly, users should remain cautious.

Important Precautions

• Provide biometric verification only through authorized devices.

• Ensure the process is being conducted by an authorized retailer.

• Verify that your fingerprint is used only for the intended transaction.

• Avoid repeated or unnecessary biometric scans without a clear reason.

• Never allow anyone to store or copy your biometric information.

Being attentive during the verification process can help reduce the risk of misuse.

Other Safety Tips When Buying a New SIM

Purchase SIM Cards Only From Authorized Stores

Always obtain your SIM card from official telecom outlets or authorized retailers.

Verify Store Credentials

Check whether the retailer is officially approved by the telecom operator before sharing personal documents.

Monitor SIM Activation

After activation, confirm that the SIM is registered in your name and linked to your correct details.

Protect Identity Documents

Do not share copies of Aadhaar, PAN, or other identity documents through unofficial channels.

Watch for Service Disruptions

If your existing SIM suddenly loses network access without explanation, contact your telecom provider immediately, as this could indicate a SIM swap attempt.

Why Mobile Security Matters

Today, a mobile number acts as a digital identity for many services. It is often connected to:

• Banking accounts

• UPI applications

• Credit cards

• Government services

• Social media platforms

• Email accounts

If a fraudster gains access to your mobile number, the consequences can extend far beyond simple phone misuse.

Final Takeaway

When obtaining a new SIM card, protecting your OTP and biometric information is just as important as protecting your bank account credentials. Cybercriminals often rely on small mistakes made during verification processes to execute larger fraud schemes.

By refusing to share OTPs, using biometric verification carefully, purchasing SIM cards only from authorized outlets, and staying alert to suspicious requests, users can significantly reduce the risk of becoming victims of SIM-related cybercrime.

A few moments of caution during SIM registration can help safeguard your identity, personal information, and financial security in the long run.