There are a few ways to check what number is registered for your Aadhaar:

1. Check the physical Aadhaar card: Your registered mobile number will be printed on the front side of your Aadhaar card.
   
2. Check online: You can check your registered mobile number on the UIDAI (Unique Identification Authority of India) website by entering your Aadhaar number and captcha.
   
3. Use the mAadhaar app: The mAadhaar app is available for download on the Google Play Store and Apple App Store. You can use this app to check your registered mobile number by linking your Aadhaar number to the app.
   
4. Call UIDAI customer care: You can call the UIDAI toll-free number (1947) and ask the customer care representative to check your registered mobile number.
   
5. Visit Aadhaar Enrolment/Update Centre: you can visit the nearest enrolment centre and ask them to check your registered mobile number.

Please note that you will need to provide proof of identity to verify your Aadhaar number before the registered mobile number can be provided.