Mobile Network Support and BandAsus Z1 Titan have Dual, (Nano Sim) Card Slots,Asus Z1 Titan support all GSM Based network providers. Asus Z1 Titan mobile device support 2G Band Frequency at GSM 850,GSM 900,GSM 1800,GSM 1900 and Hight Speed 3G Network Band at HSDPA 850,HSDPA 900,HSDPA 1900,HSDPA 2100,Asus Z1 Titan also support LTE based 4G Networks Support at Frequency level LTE 700,LTE 2100,LTE 800,LTE 1800,LTE 2600,LTE 850,LTE 1700,LTE 900,LTE 2300,LTE 2500,comes with