and on your account!!! at least that's Sprints rule... our neighbors had sprint and wanted us to add their #'s... sprint said NO.... But we will send them one of their OWN... Sprint didn't charge us for the box or the service. Because they didn't want us to change carriers. When we moved here we were going to hook it up here to boost signal and they said it would be $100.00 a month. (We are in a good coverage area here). Also they wanted the box back or they would charge us for it. they sent us a prepaid fed ex label to return it.