FACTORY UNLOCKED will work for ANY local or international GSM carriers such as T-Mobile, AT&T, Straight Talk, Ultra Mobile, Simple Mobile, Cricket and H20.
T-MOBILE IS LOCKED and will ONLY work on T-Mobile, MetroPCS, Simple Mobile and Ultra Mobile Networks.
AT&T IS LOCKED and will ONLY work on AT&T, Cricket and H20 Networks.
VERIZON IS LOCKED and will ONLY work on VERIZON, Selectel Wireless or Page Plus Networks.
Buyer is responsible for checking with their service provider to make sure which band they use.