BV5200 work with GSM network carriers like T-Mobile,BTC,MetroPCS,H2O,Movistar,Telcel,Tigo,Claro,Vivacom,Ultra Mobile,lycamobile,Tello Mobile,Bell Wireless,Rogers Wireless,Chatr, Luck Mobile,Virgin Mobile,Telus,Fido,FIZZ,Shaw Mobile,etc. IT CAN NOT WORK WITH AT&T AND CRICKET WIRELESS SIM CARDS.