Samsung Galaxy Express I437 was officially announced in October 2012, Device released in November 2012 Samsung Galaxy Express I437 made under Galaxy Series.Mobile Network Support and BandSamsung Galaxy Express I437 have Micro-SIM Card Slots,Samsung Galaxy Express I437 support all GSM Based network providers. Samsung Galaxy Express I437 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