No, even a Note 8 for a specific US carrier can't support all US carriers as far as 4G. The N950W (the Canadian version) is a single-SIM phone, and supports AT&T and T-Mobile in the US. Since it's a GSM phone, it can't support Sprint or Verizon. There's no version of the Note 8 that supports both GSM and CDMA (Sprint and Verizon). The 950FD may support both AT&T and T-Mobile, and has dual SIMs (but, as with most phones, if you're using 2 SIMs, there's no place for an SD card - the second slot is either the second SIM or the SD card).