So I have my iphone 5s listed on craigslist here in the US. A man from scandinavia has expressed he'd like to buy it when he's here on business next week. My 5s is locked on at&t, and I have it listed as "At&t" in the ad. Does this seem sketchy that a european would want the phone? Would the guy even be able to use my phone in Europe? Please forgive my complete ignorance, but the fact that he was not actually local and didn't even try to haggle the price like everyone else made me just a little extra cautious, and I'm trying to make a judgment if it's legit/reasonable. Thanks!