Begin by visiting the official UIDAI website at https://uidai.gov.in/.
Under the "My Aadhaar" tab, locate and click on the "Update Aadhaar" option.
You'll be redirected to the Aadhaar Update Service Portal, where you can initiate the mobile number update process.
Enter your Aadhaar number and generate an OTP (One-Time Password) to authenticate the update request.
Choose the "Mobile Number" field and input your new mobile number that you wish to update.
Verify the OTP received on your current mobile number linked to your Aadhaar.
Enter the OTP received and submit the mobile number update request.
Upon successful submission, you'll receive an acknowledgment containing the Update Request Number (URN) for future reference.