Please make sure gsm sim card supports making calls, sending messages, gprs network.
specifications:
network: gps/agps/lbs/wifi
battery type: 3.7v 600ma li-ion battery
charging voltage: dc 5v
frequency: 850/900/1800/1900mhz
charging input: ac 110-220v 50/60hz
gps positioning accuracy: about 10m
standby time: 10 days