A:Answer It is approved for T-mobile, but will not support native wifi calling, just their GSM network
From motorola.com, networks and bands supported:
Networks
LTE cat. 6 capable
WCDMA
CDMA
EV-DO
GSM/EDGE
Bands
GSM/GPRS/EDGE (850, 900, 1800, 1900 MHz)
UMTS/HSPA+ (850, 900, 1700 (AWS),1900, 2100 MHz)
CDMA (800, 850, 1900 MHz)
4G LTE† (B1, 2, 3, 4, 5, 7, 8, 12, 13, 17, 25, 26, 41)
Carrier-tested
Moto X Pure Edition is unlocked and confirmed to work on Verizon, AT&T, T-Mobile, Sprint, U.S. Cellular. Moto X Pure Edition is also compatible with most U.S. carriers but please contact your service provider for details.