Asus ZenFone 4 Max 5.2 ZC520KL was officially announced in September 2017, Device released in September 2017 Asus ZenFone 4 Max 5.2 ZC520KL made under Zenfone.Mobile Network Support and BandAsus ZenFone 4 Max 5.2 ZC520KL have Dual Card Slots,Asus ZenFone 4 Max 5.2 ZC520KL support all GSM Based network providers. Asus ZenFone 4 Max 5.2 ZC520KL 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