I recently upgraded my husband's phone for his birthday and it required a new sim card. I was hoping to switch from my old HTC to his old iphone. The HTC sim card doesn't fit into the iphone, so is there a way simply to change my number over to the sim card in the iphone? When I try to switch it in self serve, I get a message saying that the equipment is in use although it is no longer active on his account because he has the new one. Any thoughts?