Visit the nearest Aadhaar Enrolment/Update Centre
Carry your Aadhaar card and a valid identity proof
Fill the Aadhaar Update/Correction form
Select the mobile number update option
Enter your new mobile number in the form
Submit the form at the centre
Complete biometric verification if asked
Pay the applicable update fee
Collect the acknowledgement slip with the Update Request Number
Wait for the update to be processed
Check Aadhaar status online using the Update Request Number
Download the updated Aadhaar after the mobile number is changed