This guy and girl come through my line, and buy a verizon prepaid phone. I activate it...regular procedure...honestly you can't sell a phone if it isn't activated, there's no mistakes unless you never ring up the damn thing...the register won't let you. People leave. Come back five minutes later.
"We just walked through the doors and the things beeped."
Me: "Don't worry about it, you're all set."
Those doors go off because of ANYTHING...piercings, jewelry, keys, ect... whenever they want. Sometimes they like me, sometimes they don't...personal experience.
Pardon horrible dialogue memory today, but basically they were paranoid that the beep deactivated this phone they bought and insisted that they'd had this problem before, and this was the second or third phone they had tried to buy from our store.