Hello aspirant,

I hope that you are doing absolutely great.
With reference to your above mentioned query, i would like to tell you that NO, your Mobile number must not need to be necessarily linked with your Aadhar Card, but the mobile number that you give during the registration must be valid and must work, since all the important messages and notification will be delivered to this registered number.

Also, you need to note that  all the details, in you JEE mains registration form, should be correct and should be as per Adhaar card. So, u have to upgrade the details of Aadhar to apply for JEE Mains without any difficulty, like you name, parent's name, etc.

NTA has announced strictly, that this time there will be no corrections in the Application form.

I hope that this will help.