hi, i am trying to buy an iphone 5s from someone on craigslilst. she says the phone was never activated.. and its a cricket phone, never has been flashed. if the esn is good today but they claim its stolen after i buy it, would i not be able to use it for any other carrier, for example, metro pcs,? is there a time limit to where it will be okay after a few months? (so ive heard)? i have been scammed quite a few times and i want to know what my options are, if any. thanks!