1. Visit UIDAI Aadhar Self-Service.
2. A page with title “Aadhar Self Service Update Portal” will open.
3. Enter your 12 digit Aadhar number .
4. Now enter the Text Verification number (Captcha).
5. Then click on Send OTP .
6. Enter the OTP that was sent to your existing mobile number and click Login
7. After that, a new page asking for Details to be Updated will appear.
8. Under “ Select field(s) to update “, select “ Mobile Number: ”
9. Now enter your Mobile Number you want to Update and click Submit and Update
10. Verify and Proceed and Note down the URN you will see or take a print out. It will help you check the status of your Aadhar Update for Mobile Number.