Visit the official UIDAI website
Go to the Aadhaar services section
Select the option to book an appointment or update Aadhaar details
Choose your nearest Aadhaar Seva Kendra or enrollment center
Fill in the update request form with your mobile number
Carry your Aadhaar card and valid identity proof
Visit the center in person for biometric verification
Submit the mobile number update request
Pay the applicable update fee
Collect the acknowledgment slip with the URN
Track the update status using the URN on the UIDAI website
Download the updated Aadhaar after the mobile number is linked