Visit the UIDAI website
Go to the Aadhaar services section
Select the option to verify Aadhaar-linked mobile number
Enter your Aadhaar number
Enter the mobile number you want to check
Enter the captcha code
Submit the details
If the number is linked, you will receive a verification message or OTP on that mobile number
If no OTP is received, the number is not linked with your Aadhaar
You can also visit an Aadhaar Enrolment/Update Centre for assistance
Carry your Aadhaar card and valid ID proof if required