Qmart Q1 4.0mm Ultra Thin Slim 1.0 Inch MTK Single Core Mini Pocket Card Cell Phones Bluetooth Built-in Battery,SIM card (Golden) 4.0mm ultra thin Qmart Q1 card mobile phone mini pocket students personality children phone, the most thin card phone in the world Working Networks: GSM 850/900/1800/1900MHZ(Please make sure your sim card can work on one of the four networks before you buy this phone) Standard micro USB charging interface compatible with the charger on the market OLED full view high-definition display Support bluetooth function