Incase you have changed your your phone, which you want to update in your Aadhaar Card, fret not! It is very easy to link your mobile number with your Aadhaar number.
If you are looking to change your Facial Photograph in your Aadhaar card, it will come under Biometric information change. This is not possible via online process. For this you will have to visit a physical Aadhaar Seva Kendra.