To create or change a password you will need to know the current password attached to your extension. If you don’t know what it is, send a request to the CUIT Service Desk at email@example.com or call 212-854-1919.
The password on your extension will be set to the default password “111” by the following day. With the default password you will be able to get into PhoneMail and create a password of your own choosing.
“To set-up your iPad so that you can make and receive calls go to Settings–> FaceTime and toggle iPhone Cellular calls to the “on” position. You can also elect to receive FaceTime calls, too, and choose which of your connected phone numbers and email addresses will share your cellular connection between your iPad to your iPhone while on the same Wi-fi connection.”