How to link a mobile number with an Aadhaar card online?

Linking a mobile number with an Aadhaar card cannot be done entirely online as it requires biometric authentication. To start the process, visit the official UIDAI website to book an appointment at the nearest Aadhaar Seva Kendra. Alternatively, you can use the Indian Postal Service portal to request doorstep mobile update services. At the center or during the postman's visit, you must fill out the Aadhaar correction form and provide biometrics. A nominal fee of Rs. 50 is charged for this service.