Sony Xperia E1 Dual Sim Smart Phone Factory Unlocked D2105 4GB - Black Lightning speed by the dual-core 1.2 GHz processor Big loudspeaker capable to play music at up to 100 dB More convenient call handling with Dual SIM capability Network: 3G: 900/2100 MHz (Compatible with T-mobile's network) / GSM: 850/900/1800/1900 MHz