I just had an awful experience with this guys, In amazon they claim to sell the HTC One factory unlocked, but it ain't true, at least not international as it claims to be, as it came to me with an AC adapter from Europe, and no more than Edge technology when I inserted my sim. I will send it back next week as my job allows it, and will let you know the refund results, don't buy from them. Mine was supposed to work in AWS LTE and 1900 WCDMA band, which ain't that rare. Good luck everyone with your phones, and be joyful if they work as intended, some of us didn't had that luck.