You can link your Mobile number to your Adhaar Card, by calling to 14546 from your mobile. The service will remain open 24 hours a Day.
If you want to link your mobile number to your Aadhaar Card, then you can do by Calling 14546.
Calling 14546 will open an IVRS (A computer generated Voice menu). Listen Carefully and follow the instructions.
NOTE: You will need to enter your 12 digit Aadhaar Number, so keep it handy, before making the Call to 14546.