Mobile Number Change Letter to Bank
Ask your branch to update the mobile number linked to your account for SMS alerts and OTPs, with the old and new numbers and an ID proof.
- 100% free
- No sign-up
- Runs in your browser
- Updated October 2026
Your bank's alerts should reach your phone
Your registered mobile number is how your bank reaches you: debit and credit alerts, OTPs for card payments and net banking, UPI registration and messages about your account. If you have changed your number, lost a SIM or are still using a number from years ago, those alerts may be going to someone else. That is a security risk as well as an inconvenience.
This page opens the Change mobile number letter. Fill in your bank, branch, account number, the new number and, if you know it, the old one.
What the letter says
"My registered mobile number 97XXXXXX21 is no longer in use. I request you to update my mobile number to 98XXXXXX10 for SMS alerts, OTPs and other bank communication. I have attached a self-attested copy of my Aadhaar card for verification."
If you leave the old number empty, the first sentence changes to "I would like to register a new mobile number", which suits accounts that never had a number or where you don't remember it.
Number format checks
The tool checks that the new number is a 10-digit Indian mobile number starting with 6, 7, 8 or 9 (with or without +91) before it lets you download. A wrong digit in this letter means alerts go to a stranger, so read the number in the preview once more before you print.
Branch, ATM or app?
| Your situation | Usual route |
|---|---|
| Old number still works | Many banks allow the change at their ATM, in net banking or the app, with an OTP on the old number |
| Old number closed or lost | Branch visit with this letter and ID proof |
| Joint account | Each holder's number is updated separately; ask the branch |
| Business account | Letter on the firm's letterhead, signed by the authorised signatory |
The exact options depend on your bank, so check its website or ask at the branch.
Documents to carry
- This letter, signed the way you sign at the bank.
- A self-attested copy of an ID such as your Aadhaar card, PAN card or passport, with the original for verification. Type the document name in the Proof field and it appears in the letter.
- Your passbook or a cheque leaf, so the branch can find the account quickly.
Change your email too
If your email has also changed, use the Update email ID letter in the same group, so e-statements reach your new inbox. For a new address, there is a separate Change address letter.
In Hindi
Choose हिन्दी: "मेरा पंजीकृत मोबाइल नंबर … अब उपयोग में नहीं है। कृपया एसएमएस अलर्ट, ओटीपी और बैंक की अन्य सूचनाओं के लिए मेरा मोबाइल नंबर … अपडेट कर दें।"
Your numbers stay in your browser and are never uploaded. MuftTools is not linked to any bank.
Other bank letters
Need more options? Open the full Bank Application Letter Formats.
Frequently asked questions
How do I write an application to change my mobile number in a bank?
Address the branch manager, give your account number, say that your old number is no longer in use (or that you want to register a number), give the new 10-digit number, and ask for it to be updated for SMS alerts and OTPs. Attach a self-attested ID such as your Aadhaar card.
What if I no longer have the old SIM?
That is a common reason for this letter. Leave the old number out or write it if you remember it. The branch will verify you with ID, since OTPs can't reach the old number.
Can I change my bank mobile number without visiting the branch?
Many banks let you update it at their ATM, through net banking or in the app, often with an OTP on the old number. If the old number is closed, a branch visit with this letter and ID is usually needed.
Why is it important to update the mobile number?
Banks send transaction alerts and OTPs to the registered number. If it belongs to someone else now, you could miss fraud alerts or be unable to use net banking and UPI.