Hii Anshu Deo..

Follow the steps below:

1. go at http://uidai.gov.in/

2. click on verify aadhaar number.

3. you will be asked to enter your 12 digit aadhaar number.

4. then enter security code and click on verify.

5. after clicking on verify, you will get a new window with mobile number which is linked with your aadhaar.

Hope this helps you. All the best.