Keeping your mobile number updated with your bank is essential to ensure you receive timely transaction alerts, OTPs, and account notifications without interruption. Below are 15 professionally crafted sample letters to help you formally request your bank to update your mobile number on record.
Sample Letter 1: Simple Mobile Number Update Request
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Request for Change of Registered Mobile Number
Dear Sir/Madam,
I, [Your Name], hold Savings Account No. [XXXXXXXXXXXX] at your [Branch Name] branch. I kindly request you to update my registered mobile number from [Old Mobile Number] to [New Mobile Number] in your records for all future communications and SMS alerts.
I have attached a self-attested copy of my Aadhaar card and a photocopy of my current mobile bill as proof. Kindly process this change at the earliest and confirm once completed.
Thank you for your prompt attention.
Sincerely,
[Your Signature]
[Your Name]
Sample Letter 2: Mobile Number Change Due to SIM Swap
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Change of Registered Mobile Number Post SIM Swap
Dear Sir/Madam,
I wish to inform you that I have recently changed my mobile service provider and my new SIM card bears the number [New Mobile Number]. Please update my bank records by replacing the old number [Old Mobile Number] with the new number for all SMS notifications and OTP deliveries.
Enclosed are copies of my latest mobile recharge receipt and a self-attested identity proof. I appreciate your prompt action on this matter.
Thank you.
Yours faithfully,
[Your Signature]
[Your Name]
Sample Letter 3: Update for OTP and Transaction Alerts
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Request to Update Mobile Number for OTP and Alerts
Dear Sir/Madam,
I am writing to request that my registered mobile number for receiving OTPs and transaction alerts be updated from [Old Mobile Number] to [New Mobile Number]. My account details are as follows:
Account Holder Name: [Your Name]
Account Number: [XXXXXXXXXXXX]
Please find attached a copy of my ID proof and the new mobile service confirmation. I look forward to your confirmation once the update is completed.
Thank you for your assistance.
Warm regards,
[Your Signature]
[Your Name]
Sample Letter 4: Joint Account Mobile Number Change
[Your Name] & [Co‑Holder Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Change of Registered Mobile Number for Joint Account
Dear Sir/Madam,
We, the undersigned, are joint holders of Savings Account No. [XXXXXXXXXXXX] in the name of [Your Name] & [Co‑Holder Name]. We request you to update our registered mobile number to [New Mobile Number] in place of [Old Mobile Number] to receive consolidated SMS alerts.
Kindly find the self-attested copies of our identity proofs and a joint letter of consent attached herewith. Please update the records and intimate us once done.
Thank you.
Yours faithfully,
[Your Signatures]
[Your Name] & [Co‑Holder Name]
Sample Letter 5: Urgent Update After Mobile Loss
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Urgent Request for Mobile Number Change Due to Phone Loss
Dear Sir/Madam,
I regret to inform you that I lost my mobile phone bearing the number [Old Mobile Number] on [Date of Loss]. For security reasons, please update my registered mobile number to [New Mobile Number] immediately to prevent any unauthorized transactions.
Attached is a copy of the FIR filed at [Police Station Name] and my new SIM card details. I appreciate your swift action in this urgent matter.
Thank you for your support.
Sincerely,
[Your Signature]
[Your Name]
Sample Letter 6: Senior Citizen Mobile Update Request
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: CHANGE OF REGISTERED MOBILE NUMBER (SENIOR CITIZEN ACCOUNT)
Dear Sir/Madam,
As a senior citizen account holder (A/c No. [XXXXXXXXXXXX]), I request you to change my registered mobile number from [Old Mobile Number] to [New Mobile Number], so I can receive important banking alerts and OTPs without hindrance.
Please find my senior citizen identity card and new mobile bill attached. Your prompt action will be highly appreciated.
Thank you.
Yours faithfully,
[Your Signature]
[Your Name]
Sample Letter 7: Corporate Account Mobile Number Change
[Company Letterhead]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Update of Authorized Signatory Mobile Number
Dear Sir/Madam,
We are writing on behalf of [Company Name], holding Current Account No. [XXXXXXXXXXXX]. Please update the registered mobile number of our authorized signatory, Mr./Ms. [Name], from [Old Mobile Number] to [New Mobile Number] for all e‑transaction alerts.
Enclosed are a board resolution and KYC documents of the authorized signatory. Kindly update your records and confirm the change.
Thank you.
Sincerely,
[Authorized Signatory Name & Designation]
[Company Seal]
Sample Letter 8: Update for SMS Banking Services
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Change of Mobile Number for SMS Banking
Dear Sir/Madam,
I request you to update my mobile number for SMS banking from [Old Mobile Number] to [New Mobile Number] for account No. [XXXXXXXXXXXX]. This change will ensure uninterrupted access to balance enquiries and mini‑statements via SMS.
Attached is my request form and identity proof. Please make the update and notify me when completed.
Thank you.
Warm regards,
[Your Signature]
[Your Name]
Sample Letter 9: Email Request for Mobile Update
From: [Your Email Address]
To: [Bank’s Customer Service Email]
Subject: Request to Change Registered Mobile Number
Dear Customer Service Team,
I am writing to request an update of my registered mobile number. My account details are:
Name: [Your Name]
Account Number: [XXXXXXXXXXXX]
Old Mobile Number: [Old Mobile Number]
New Mobile Number: [New Mobile Number]
Please update your records and confirm via email once the change is effected. Attached are scanned copies of my ID proof and new mobile bill.
Thank you for your assistance.
Best regards,
[Your Name]
Sample Letter 10: Request with KYC Documents
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Mobile Number Update with KYC Documents
Dear Sir/Madam,
I request you to change my registered mobile number from [Old Mobile Number] to [New Mobile Number] for Savings Account No. [XXXXXXXXXXXX]. I have enclosed updated KYC documents including my PAN card and latest utility bill.
Please process this request at your earliest convenience and update the SMS alert settings accordingly.
Yours faithfully,
[Your Signature]
[Your Name]
Sample Letter 11: NRI Account Mobile Number Change
[Your Overseas Address]
[City, State/Province, Country, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Change of Registered Mobile Number for NRE Account
Dear Sir/Madam,
I hold an NRE Savings Account (A/c No. [XXXXXXXXXXXX]) at your branch. I request the update of my registered mobile number from [Old Mobile Number] (India) to [New Overseas Mobile Number] for all OTPs and SMS notifications.
Please find attached the required KYC form and a copy of my passport. Kindly confirm via email once the update is successful.
Thank you for your cooperation.
Sincerely,
[Your Signature]
[Your Name]
Sample Letter 12: Minor Account Guardian’s Update Request
[Guardian’s Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Update of Mobile Number for Minor’s Account
Dear Sir/Madam,
I am the guardian of Minor Account No. [XXXXXXXXXXXX] held by my child, [Child’s Name]. I request you to update the registered mobile number from [Old Mobile Number] to [New Mobile Number] under my guardianship for all SMS alerts.
Enclosed are copies of my ID and the minor’s birth certificate. Please update the records and send a confirmation SMS to the new number.
Thank you.
Yours sincerely,
[Guardian’s Signature]
[Guardian’s Name]
Sample Letter 13: Update for Online Banking Alerts
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Request to Change Mobile Number for Online Banking Alerts
Dear Sir/Madam,
I request you to update my registered mobile number to [New Mobile Number] from [Old Mobile Number] for receiving online banking transaction alerts on Savings Account No. [XXXXXXXXXXXX].
I have attached a duly filled mobile update form along with my ID proof. Please process this request urgently and confirm via SMS.
Kind regards,
[Your Signature]
[Your Name]
Sample Letter 14: Mobile Update Due to Relocation
[Your Name]
[Your New Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Change of Registered Mobile Number After Relocation
Dear Sir/Madam,
I recently relocated to [New City], and my mobile number has changed from [Old Mobile Number] to [New Mobile Number]. Kindly update my bank records for Account No. [XXXXXXXXXXXX] to ensure I continue receiving SMS notifications.
Enclosed are proofs of my new address and mobile connection. I appreciate your prompt update.
Thank you.
Sincerely,
[Your Signature]
[Your Name]
Sample Letter 15: Update After SIM Deactivation
[Your Name]
[Your Address]
[City, State, ZIP Code]
[Email Address]
[Date]
The Branch Manager
[Bank Name]
[Branch Name]
[Branch Address]
[City, State, ZIP Code]
Subject: Request to Change Mobile Number Post SIM Deactivation
Dear Sir/Madam,
My previous SIM (number [Old Mobile Number]) has been deactivated. Please replace it with [New Mobile Number] in your records for my Savings Account No. [XXXXXXXXXXXX], so I can continue to receive SMS alerts and OTPs.
I have attached the deactivation certificate and the new SIM documentation. Your prompt action in this regard will be highly appreciated.
Yours truly,
[Your Signature]
[Your Name]
True or False Quiz
Test your knowledge of writing a formal request letter to a bank for changing your registered mobile number. Select True or False — you'll see instantly whether you're right!
1. A formal request letter should always start with "Dear Sir/Madam".
2. You should include your account number in the request letter.
3. It is acceptable to use slang phrases to make the letter more personal.
4. You do not need to attach any documents when requesting a mobile number change.
5. Including a clear subject line is optional in a professional letter.
6. The salutation can be omitted if you know the branch manager personally.
7. You should end the letter with "Yours sincerely" after your signature.
8. You must mention both the old and new mobile numbers in the letter.
9. It's appropriate to write the letter in a casual tone when addressing bank officials.
10. You should date the letter at the top of the page.
11. A joint account holder does not need to sign the letter if one holder signs.
12. Including an email address alongside your mobile number is recommended.
13. Using bank-specific jargon in a customer letter can cause misunderstanding.
14. It's unnecessary to request confirmation of the mobile number update in the letter.
15. Handwritten letters are no longer accepted by banks for KYC updates.