To change the mobile number or email linked to your bank account, write a short signed letter to your branch giving your name, account number, the old and new contact details, and a clear request to update them, and attach the ID proof the bank asks for. For business accounts, the letter must be signed by the authorised signatories on the bank's mandate, usually on letterhead, because the contact details control OTPs and alerts for the whole account.
Key takeaways
- A contact update letter needs five things: account holder name, account number, old details, new details and a signature that matches bank records.
- Individuals can often update contact details through other channels too; check what your bank offers. A letter works at any branch.
- Company and LLP accounts generally need letterhead and authorised signatories. Some banks may ask for a board resolution or authority letter.
- For exporters, the registered email and mobile receive OTPs, trade alerts and remittance messages. A stale number can delay foreign payments.
- If you get a confirmation of a change you did not request, contact your bank immediately.
Why this matters more for exporters
For a salaried individual, an old mobile number is an inconvenience. For a business receiving foreign payments, it can cost days.
Your registered contact details are typically where your bank sends OTPs for net-banking approvals, alerts about inward remittances, queries about purpose codes or missing documents, and sometimes copies of advices. If the finance manager who left last year is still the registered contact, those messages go nowhere. Banks may hold an inward credit while they wait for information, including the EDF for that month, so a missed message can turn into a held payment.
Review your registered contacts whenever a signatory, finance head or accountant changes.
What to include
| Element | Individual account | Business account |
|---|---|---|
| Paper | Plain paper is usually fine | Company letterhead |
| Account holder | Your full name as in bank records | Registered name of the business |
| Account number | Full number | Full number |
| Customer ID | If you know it | If you know it |
| Old details | Old mobile and/or email | Old mobile and/or email |
| New details | New mobile and/or email | New mobile and/or email, and whose they are |
| Reason | Optional | Helpful, such as "change of finance contact" |
| Signature | Account holder; all holders for joint accounts if required | Authorised signatories as per mandate, with seal if the bank uses one |
| Attachments | ID proof, as the bank asks | ID of signatories; board resolution or authority letter if asked |
Banks set their own documentation rules, and they can differ between savings and current accounts. Ask the branch what it needs before you visit. Our KYC glossary entry explains why banks ask for identity documents when contact details change.
Sample letter: individual account
Date: 12 October 2026
To The Branch Manager [Bank name], [Branch name and address]
Subject: Request to update registered mobile number and email – Savings Account No. [XXXXXXXX2093]
Dear Sir/Madam,
I, Nandini Iyer, hold the above savings account with your branch. Please update my registered contact details as follows:
Old mobile number: 98XXXXXX10 New mobile number: 97XXXXXX45 Old email: nandini.iyer@[olddomain] New email: nandini@[newdomain]
A self-attested copy of my identity proof is enclosed. Please confirm once the change has been made.
Yours faithfully,
[Signature] Nandini Iyer Customer ID: [ID]
Sample letter: company current account
[On company letterhead]
Date: 12 October 2026
To The Branch Manager [Bank name], [Branch name and address]
Subject: Change of registered mobile number and email – Current Account No. [XXXXXXXX7718] – Trillium Softworks Pvt Ltd
Dear Sir/Madam,
We request you to update the registered contact details for the above current account, consequent to a change in our finance team.
Existing mobile: 99XXXXXX02 (Mr. Arvind Shetty, former Finance Manager) New mobile: 90XXXXXX61 (Ms. Leena Fernandes, Finance Manager) Existing email: arvind.s@trilliumsoftworks.example New email: finance@trilliumsoftworks.example
Please ensure that alerts for inward foreign remittances and trade-related communication are also sent to the new contact details.
Self-attested identity documents of the signatories are enclosed. Please let us know if a board resolution or any other document is required.
Yours faithfully, For Trillium Softworks Pvt Ltd
[Signature] [Signature] [Name], Director [Name], Director
Our free mobile and email update letter generates both versions with your details filled in.
Tips for business accounts
- Use a role-based email such as finance@ or accounts@ rather than a personal address. It survives staff changes.
- Pick a mobile the business controls. A company-owned SIM is easier to hand over than an employee's personal number.
- Update everything in one go. If the signatory has changed too, combine this with a change of signatory request; some banks prefer that sequence.
- Mention trade communications. Ask that remittance alerts and trade desk correspondence follow the new contact.
- Check after the change. Log in, trigger an OTP, and confirm alerts arrive.
If someone other than a signatory will hand in the letter, our authority letter for bank lets you nominate them.
Security points
Contact changes are a target for fraud, because whoever controls the registered mobile controls OTPs.
- Never share OTPs, net-banking passwords or card details with anyone, including callers claiming to be from the bank.
- If you receive a message confirming a contact change you did not ask for, call the bank on the number printed on its official website or your cheque book and ask them to block the change.
- Hand the letter in yourself, or through someone you trust with a proper authority letter.
This is general information, not legal or tax advice.
Frequently asked questions
How do I write a letter to my bank to change my mobile number?
Address it to the branch manager, give your name and account number, state the old and new mobile numbers, ask for the update, sign it as per bank records and attach the ID proof the bank asks for. For a business, use letterhead and have the authorised signatories sign.
Can I update my email address with the same letter?
Yes. List the old and new mobile number and email in one letter. Banks usually process both together, subject to their verification steps.
What documents do banks ask for when changing contact details?
It varies by bank and account type. Individuals are commonly asked for identity proof; businesses may be asked for signatory IDs and sometimes a board resolution or authority letter. Ask your branch before you visit.
Why does my registered mobile matter for export payments?
Banks send OTPs, inward remittance alerts and document requests to registered contacts. If they cannot reach you, a foreign payment may sit pending while the bank waits for information such as your EDF.
Who should sign the letter for a company account?
The authorised signatories as recorded in the bank's mandate, in the combination the mandate requires. If signatories have changed, update the mandate first or at the same time.
Bottom line
Keep your bank's contact records as current as your client list, especially if foreign payments flow through the account. Generate a signed-ready version with our free mobile and email update letter, or browse other formats in our guide to writing formal letters to a bank manager.
This guide is general information for Indian businesses, not legal or tax advice. Rules and bank processes change — confirm specifics with your AD bank or chartered accountant.