SIM swap fraud: signs and what to do (India)
Last updated: 2026-07-11
The clearest sign of a SIM swap is your own phone suddenly showing "no service" or losing signal for no reason — calls and SMS stop working, even though you are in a covered area and have paid your bill.
In a SIM swap, a fraudster gets a duplicate or replacement SIM for your phone number — by tricking your mobile operator, or through a porting request — so your calls, SMS, and one-time passwords (OTPs) go to them instead of you. With your OTPs, they can drain your accounts. If your signal has dropped for no reason, treat it as urgent and act now — the time-critical steps are below.
Signs your SIM may have been swapped
| What you notice | What it can mean |
|---|---|
| Your phone suddenly shows "no service" / no signal for no reason, in a place where it normally works | Your SIM may have been deactivated by a swap — the strongest single sign. |
| Calls and SMS stop — you can't call out, and nothing comes in | Your number may now be active on someone else's SIM. |
| You stop receiving OTPs and bank SMS you would normally get | Those messages may be going to the fraudster's phone. |
| You get a call or SMS asking you to approve a "SIM upgrade", "4G/5G upgrade", or "KYC" by sharing an OTP | This may be the fraudster trying to complete the swap — a real operator won't ask you for an OTP this way. |
| You see account alerts, password-reset messages, or logins you did not start | Someone with your OTPs may already be inside your accounts. |
A short network drop can be ordinary. But signal that is gone and stays gone for no reason — especially alongside any of the other signs — is worth treating as a possible swap and checking right away.
What to do right away — in order
Speed matters. While your number is on the fraudster's SIM, your OTPs are theirs. Use another phone — a family member's or a friend's — because your own phone has no signal.
- From another phone, call your mobile operator to report the SIM as compromised, block the fraudulent SIM, and reclaim your number. Getting your number back is what stops the OTPs flowing to the fraudster.
- Tell your bank to freeze or watch the account. Ask them to flag any transaction as unauthorised, block further debits, and stop transfers while your number is not in your control.
- Report to 1930, the national cyber-crime helpline, and file a complaint at cybercrime.gov.in. Note the reference and acknowledgement numbers.
- Secure your accounts from a trusted device. Once you have your number back, change your net-banking and UPI PINs and your account passwords — do this from a different, trusted device, not the phone that was affected.
- Check for unauthorised logins and changes: unknown logins, changed passwords, new payees, or email-forwarding rules you did not set. Undo anything you did not do.
Act fast — the sooner you reclaim the number and report, the better the chance that your operator, 1930, and your bank can stop the money before it is withdrawn. Recovery is possible but never guaranteed.
How to lower the risk
Never share an OTP for a "SIM upgrade", "4G/5G upgrade", or "KYC update" — a real mobile operator will not ask you to read out an OTP to approve these. If your signal drops for no reason and stays down, check whether your SIM is still active rather than waiting for it to come back on its own.
Beware a second scam: the only ways to report are 1930, cybercrime.gov.in, your mobile operator, and your own bank. Anyone who phones or messages offering to recover your lost money or "restore" your number for a fee — a "recovery agent", "refund officer", or fake "cyber cell" — is a fresh fraud. Never pay to get your money or your number back.
The full first-hour steps for money that has left your account are here: UPI fraud — what to do in the first hour. To report, see how to report online fraud: cybercrime.gov.in and 1930.
If the bank does not help
Keep every complaint acknowledgement number. If your bank does not resolve the matter within a reasonable time, you can escalate to the RBI Ombudsman (cms.rbi.org.in) and seek redress through the National Consumer Helpline (1915). All of these are linked below so you can act directly.
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