Visit the official UIDAI website or Aadhaar Seva Kendra
Book an appointment or walk in to the nearest Aadhaar update center
Fill out the Aadhaar update/correction form
Enter your new mobile number in the contact details section
Submit the form with your Aadhaar number
Complete biometric verification if asked
Pay the applicable update fee
Collect the acknowledgment slip with the URN
Use the URN to track the update status
Wait for the mobile number update to be processed
Note that mobile number updates cannot be done online without biometric verification