Earlier there was no need to visit any Aadhaar center to link mobile number with Aadhaar, but now there is no need for it. To link the mobile number with Aadhaar one has to visit the Aadhaar center which is also located in the bank.
After this you will have to fill a form in which you will have to provide a new mobile number. After filling the form, it will have to be given to the concerned officer at the centre. After this your application will be submitted and you will get an acknowledgment number. Next week your new phone number will be linked to your Aadhar card.