Philips W337 was officially announced in November 2012, Device released in November 2012Mobile Network Support and BandPhilips W337 have Dual, (Mini-SIM) Card Slots,Philips W337 support all GSM Based network providers. Philips W337 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 1900,comes with network handling support with Network settings and work offline with flight Mode.