Visit your bank branch or use the bank’s official mobile banking/app/website if online update is allowed
Carry a valid ID proof, bank passbook, debit card, and any required account details
Fill out the mobile number update request form
Enter your old mobile number and new mobile number correctly
Submit the form along with any required documents
Complete OTP verification if the bank sends one to your old or new number
Verify your identity through branch staff, ATM, net banking, or app-based authentication if required
Wait for the bank to process the request
Check SMS alerts or account access on the new mobile number after activation
Contact customer care if the number is not updated within the stated time