LG Optimus GT540 review with video. LG Optimus GT540 Unlocked GSM Quad-Band Phone with 3 MP Camera, Android OS, Touch Screen, Wi-Fi, Bluetooth. Technical Details GSM 850/900/1800/1900, UMTS 900/2100, HSDPA 7.2; Touch Screen: 320 x 480, 3.0", HVGA, 262K, TFT; Wi-Fi, Browser, Speaker Phone, External Memory (MicroSD up to 32GB (not included)), MP3, Bluetooth v2.1 with A2DP, Video Recording, 3.5 Audio Jack, Document viewer, Organizer; Talk Time: Up to 5 h 30 min (2G) / Up to 7 h 20 min (3G). Stand-by Time: Up to 500 h (2G) / Up to 500 h (3G)