You have to make sure that your phone is programmed to transfer calls to another number. If it is, then lift the receiver and dial: * 72 and when you hear a dial tone then enter your cell phone #: 1-XXX-XXX-XXXX.
Permit is defined as an official document that allows you to do or have something. An example of a permit is a gun license. An example of a permit is a city-issued allowance for a parade. An example of a permit is the ticket that says you paid for parking.
A visa is an official 'permit' authorizing you to enter the USA, for a specific reason and for a specified period of time. There are many different types of visas / permits and depending on the nature of your visit to the USA (e.g. travel, study, work), this will decide which is the most appropriate visa / permit for you.