When you arrive in the USA/CAN, simply power up your phone and our 360travelsim sim will automatically connect to our Prefered Roaming Network ( PRN ) for USA or CANADA, its that easy. On some handsets, you may need to restart your phone for the profile to become active. You can manually change network providers , but that is not advised, you will still be able to receive and make calls, but this will not be free and will be charged at rates beyond our control. To receive calls FREE and make calls at the advertised pricing please make sure you are roaming on the USA/CAN (PRN) Prefered Roaming Network.