ZTE Blade A520 was officially announced in February 2017, Device released in March 2017Mobile Network Support and BandZTE Blade A520 have Hybrid Dual Sim Card Slots,ZTE Blade A520 support all GSM Based network providers. ZTE Blade A520 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,ZTE Blade A520 also support LTE based 4G Networks Support at Frequency level LTE