I went back to the Verizon store after realizing that I need a new SIM card to switch the phone back to my line.
The manager told me that if I wait 24 hours, the SIM card that came with the iphone 5 can be switched to a different line, so no need for a separate SIM card.
My plan is to wait until tomorrow to test this out and see if it's true.
But your phone works on your line, just with 3g and no LTE???? Is that correct? The sim is only for the LTE right?