Aadhaar Card Update: Check steps to change Aadhaar-linked mobile number

If your mobile number has not yet been registered with Aadhaar, you must go to an Aadhaar Kendra to do so. Aadhaar cardholders should have their cards linked to phone numbers in order to use digital services.

source https://www.caclubindia.com/articles/aadhaar-card-update-check-steps-to-change-aadhaar-linked-mobile-number-46960.asp