Visit your SBI branch with your passbook, debit card, and valid ID proof
Ask for the mobile number update form or customer information change form
Fill in your new mobile number and other required details
Submit the form to the bank official
Complete any required verification, such as OTP, signature, or biometric check
If required, link your new number through SBI ATM or SBI Internet Banking
Wait for confirmation from the bank
Check SMS alerts on your new mobile number after the update is processed