Maybe your phone is scratched up, the battery won’t hold a charge anymore, or you’re just plain sick of it. Whatever the reason, you start to shop around for a new phone, but all your budget will allow is a bland, mid-range device. So you hop online to see what kind of bargain you can pick up second hand. Someone is selling last year’s flagship iPhone or Samsung Galaxy, barely used, at a drastically lower price. You pounce and secure yourself a shiny new smartphone at a steal. The phone arrives in a couple of days, as described, and you...