There are separate procedure through which you can register the number with the account. Its not always require to have the same mobile number linked to the aadhar card to be the pass book number. You can contact the helpdesk of ICICI bank (available on there official website) & get it discussed, they will provide you all the details regarding the procedure of apply for the mobile number. It's not at all necessary to provide the same number with which your Aadhar is linked.

I hope this helps. Have a great eve!