About: This advisory explains the RBI/TRAI mandate that authentic bank service calls come only from the 1600xx series and promotional calls from the 140xx series. It clarifies the risks of trusting regular 10-digit mobile numbers, shows how to verify genuine bank contact, and lists practical steps to protect your money and identity.

Note: This post is informational and intended for investor & consumer safety. Follow the verification checklist and share it with family members who may be vulnerable to voice-phishing (vishing) scams.

The regulators—Reserve Bank of India (RBI) and Telecom Regulatory Authority of India (TRAI)—have mandated standardised numbering for bank-originated calls. Under these rules, banks must use specified shortcode series for particular types of calls:

• Service & verification calls: originate only from numbers in the 1600xx series.
• Promotional or informational calls: originate only from numbers in the 140xx series.

Any caller claiming to be a bank from a regular 10-digit mobile number is inconsistent with this mandate and should be treated as suspicious.

Scammers deliberately use normal 10-digit mobile numbers to mimic trusted voices and bypass casual scepticism. Their goals include:

• Extracting OTPs, PINs or CVV numbers by urgent persuasion.
• Installing remote-access apps or obtaining authentication codes.
• Creating fear (e.g., fraudulent claims of unauthorised transactions) to force immediate action.

Remember: banks will never ask for OTPs, full PINs, CVV, or Internet banking passwords over the phone.

Use this step-by-step verification checklist whenever you receive a call claiming to be from a bank:

1. Check the calling number: If it is a standard 10-digit mobile number, treat it as suspicious. Authentic service calls come from 1600xx series and promotional calls from 140xx series.
2. Do not share OTPs or PINs: Banks never ask for OTPs, full card numbers, CVV, or internet banking passwords.
3. Ask for official caller ID or callback channel: Request the number they are calling from and tell them you will call the bank on the official helpline back. Then hang up.
4. Use the bank's official number: Always call back using the number on your bank’s website, passbook, or the number printed on the back of your debit/credit card.
5. Verify the message via netbanking / app: Check transaction alerts in the official bank app—if nothing matches, the call is fake.
6. Report suspicious calls: Log the number and report it to your bank and to the national cybercrime helpline if needed.

Red flags to watch for during any unsolicited call:

• Pressure to share OTP immediately or to approve a transaction.
• Requests to install apps or click on links sent via SMS/WhatsApp.
• Caller refuses to let you call back on the official helpline or tries to transfer you to another number.

If you encounter any of these, treat the interaction as fraudulent and terminate the call. Then contact your bank using published official numbers.

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Act fast. If you have accidentally shared an OTP, PIN, card details, or password, follow these steps immediately:

1. Block the affected card using the bank’s official app or helpline.
2. Change net-banking or UPI passwords immediately.
3. Raise a dispute for any unauthorised transactions.
4. File a complaint with the bank’s fraud cell and preserve all call logs and SMS evidence.
5. If significant loss is suspected, report to local police and the cybercrime portal.

Share this advisory with elderly family members and less tech-savvy relatives. Practical family steps:

• Create a family checklist with official bank helplines and keep it handy.
• Teach family members to never share OTPs or passwords—even if the caller sounds urgent.
• Encourage using bank apps for transaction verification rather than trusting voice calls.

⚠️ Always verify calling numbers: genuine bank service calls are from 1600xx and promotional calls are from 140xx. Do not trust regular 10-digit mobile numbers claiming to represent banks.

Use the verification checklist above, teach family members the red flags, and act quickly if any sensitive information is exposed.

Read more safety and market guidance at Indian-Share-Tips.com, which is a SEBI Registered Advisory Services.