In a SIM swap fraud, a criminal persuades your mobile operator to issue a duplicate SIM of your number — and the moment it activates, your own phone loses signal while every OTP and banking alert flows to the fraudster. Within minutes they can reset passwords and empty accounts. The single most important warning sign is your phone unexpectedly showing “No Service” or “SIM not provisioned” for no reason. Treat that as an emergency, not a network glitch.
How the fraud works
- The fraudster first gathers your details — name, number, date of birth, sometimes ID copies — through phishing, data leaks or a fake “KYC update” call.
- They approach the telecom operator (in person or through a compromised retailer) and request a replacement SIM, claiming the original is lost or damaged.
- Once the new SIM is activated, your SIM goes dead. All OTPs, banking SMS and app verifications now reach the fraudster.
- They log into net-banking or UPI, authorise transfers with the intercepted OTPs, and move the money out quickly.
The warning signs
- Sudden, unexplained loss of network on your phone.
- Not receiving calls or texts you were expecting.
- Alerts that a “SIM change request” or “new SIM” has been raised — sometimes sent by the operator itself.
- Being unable to log into your email or banking app because the password was changed.
The law that applies
SIM swap fraud typically involves several offences at once:
- Section 66C of the IT Act — identity theft (fraudulent use of your OTPs and identifiers).
- Section 66D of the IT Act — cheating by personation using a computer resource.
- Cheating and, frequently, criminal breach of trust or forgery under the Bharatiya Nyaya Sanhita, 2023, where forged documents are used to obtain the duplicate SIM.
There is often shared responsibility: where an operator or its retailer issued a duplicate SIM without proper verification, that lapse is relevant both to your bank-liability claim and to any civil remedy.
What to do — fast
- Restore your number. Contact your operator from another phone, report the swap and get the fraudulent SIM deactivated and your number restored.
- Freeze your bank. Call the bank’s fraud line, block cards and UPI, and ask for transactions to be held or reversed.
- Report to 1930 and file at cybercrime.gov.in immediately — the golden-hour freeze can catch the money before it is layered.
- Secure your accounts. Change email and banking passwords, and switch OTPs to an authenticator app where possible.
- Gather proof. Get the SIM-change record and timing from your operator; save all bank alerts. This links the swap to the theft.
Frequently asked questions
Can I recover the money?
Often yes, if you act within the golden hour and report promptly. RBI’s limited-liability framework and a representation showing you reported without delay strengthen the claim, especially where the operator’s verification was deficient.
Is the telecom company liable?
Where a duplicate SIM was issued without proper KYC, the operator’s negligence can be pursued — this is a fact-specific question worth examining with counsel.
How Advocate Sudhir Rao can help
If you have been targeted — or wrongly accused — in a matter like this, the first 48 hours usually decide how quickly it is resolved. As an Advocate practising before the Supreme Court of India, the Delhi High Court and the District Courts across Delhi NCR, I help clients respond to cyber cells, secure the release of frozen accounts, and defend against or pursue complaints under the Bharatiya Nyaya Sanhita (BNS) and the Information Technology Act.
Consultations are confidential and privileged. For urgent matters, call +91 97295 06771 or book a consultation.
This article is general legal information, not legal advice, and does not create an advocate–client relationship. Statutory section numbers can change with amendments; your specific facts should be checked with counsel before you act.
Facing a similar matter? Speak to a criminal lawyer in Delhi — Advocate Sudhir Rao appears in bail, trial and appellate matters before the Delhi District Courts, the Delhi High Court and the Supreme Court of India.