To ensure it will work for you, go look at the specs listings the X Performance bands and protocols and then look up your carrier's bands and protocols. European and Asian market phones often lack full band coverage in the US, so while you will most likely have some coverage you could be missing bands that hamper your ability to get coverage in some parts of the US or not allow you to get the fastest speeds. I loved my Z3C, but the lack of a finger print sensor with full T-Mobile band coverage caused me to get the OnePlus 3, which is a fantastic phone at any price.