Visit the UIDAI website
Open the “Verify Email/Mobile Number” service
Enter your Aadhaar number
Enter the mobile number you want to check
Enter the captcha code
Click on “Send OTP”
If the mobile number is linked, you will receive an OTP on that number
If no OTP is received, the mobile number is not linked to that Aadhaar
You can also check by visiting an Aadhaar Seva Kendra or UIDAI enrollment center
Carry your Aadhaar card and ask the center to verify the linked mobile number