If you want to try SFOS in US before Xperia comes preloaded, the OnePlus One and X have good ports and work pretty well here. 4g on the X isn't the best everywhere, so if dara speed is a priority for you might not be your 1st choice. The One is a 2 year old device but still very competent... SFOS 2.0.5.6 works on both.