Xiaomi might not be compatible with US 4G LTE. Besides,

quality is not that good at all. GPS navigation is WAY off. Actually, it is a known problem that Xiaomi cellphone has GPS issues.   Camera is also not on par with apple or Samsung. Would stay away from Xiaomi if you would like to keep it as a daily-use phone in US.  For the price of a Huawei high-end phone, I would pay a couple hundred more and get a Iphone 6s plus.