I upgraded to a new phone, and my old iPhone 5 still says "Verizon" in the upper left corner and shows several bars of signal. According to the Verizon rep I spoke to, it's been deactivated on my account and sure enough, it can't make phone calls. I've tried powering down and reseating the SIM card, but "Verizon" always pops back up. Anyone know how to fix this?