This device DOES NOT INCLUDE A SIM CARD being that it is GSM unlocked it will work with any micro SIM card on any GSM network.
This device will relock to the AT&T network once reformatted therefore dont reformat the device if you need it to work with a Network other than AT&T.
Frequency supported: 4G LTE - 700 MHz and AWS (1700/2100 MHz) HSPA+/HSPA (850/1900/2100 MHz) EDGE/GPRS (850/900/1800/1900 MHz)
Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers) Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin
Internationally Compatible in 100 Countries that support GSM Frequencies (contact your network provider prior to purchasing for verification that they support GSM frequencies).