Visit the official UIDAI website: https://uidai.gov.in
Go to the “My Aadhaar” section
Click on “Book an Appointment” or “Update Aadhaar”
Select your city and Aadhaar Seva Kendra
Choose “Mobile Number Update” if available
Enter your Aadhaar number and captcha
Fill in the required details and submit the request
Book an appointment at the Aadhaar Seva Kendra
Visit the center with your Aadhaar card and supporting documents if required
Provide your new mobile number for update
Complete biometric verification if asked
Pay the applicable update fee
Collect the acknowledgment slip with the Update Request Number
Wait for SMS confirmation after the update is processed
Check the update status on the UIDAI website using your URN
Note: mobile number update is usually not done fully online; biometric verification at an Aadhaar center is generally required