Ha true. Anybody have any experience importing phones? Not that I'm planning to, I just see deals come up all the time and am curious about the process of buying on these sites.
I'm glad you asked! Yes I have done it, I got a Mi Mix from Gearbest without issue, also I traded for an International Mate 9 a couple months before the US release. In both cases I knew ahead of time that the devices had LTE in the US. In the case of the Mate 9 all LTE bands from T-Mobile (except the newest that no one has), and in the case of the Mi Mix while it did not have band 12, it did have 2 other T-Mobile LTE bands and I almost always got a good LTE signal.
You need to check what radios/frequencies the device has BEFORE you import it, and you must accept what it has. Additionally there will be no US warranty, and returning the device will be difficult if not impossible.