There is a Ubuntu phone available for U.S. delivery, the Aquarius E5 Ubuntu edition smartphone.
As The Verge pointed out during the summer, the $220 device is a pretty nice if fairly basic phone when used in Europe. Here in the States, it’s little more than a high tech brick. It doesn’t have LTE, and its HSPA+ antennas don’t support the frequencies used by T-Mobile and AT&T, the two carriers with which it’s kinda sorta compatible. You will, however, be able to connect with 2G, which means the relatively lightweight pages FOSS Force serves will take several minutes to load. The ad laden sites that supply the click baity quizzes you like to go to from Facebook will probably load in an hour or so if you don’t get some kind of time out error first.