You cannot change the mobile number in CoWIN without OTP
OTP verification is required to update or access the registered mobile number
If you no longer have access to the old number, use the CoWIN helpdesk or support channel
Contact the vaccination center or health authority for assistance with record correction
Use the official CoWIN portal support options to request a mobile number update
Keep your Aadhaar, vaccination details, and registered beneficiary information ready for verification
If needed, register a new account with the new mobile number and link your vaccination details through official support