Palm Treo Pro Unlocked Phone with 2 MP Camera, 3G, Wi-Fi, GPS, and MicroSD-U.S. Version with Warranty (Black) Quad-band GSM cell phone compatible with 850/900/1800/1900 frequencies Sreamlined smartphone with Windows Mobile 6.1 for access to push email, full QWERTY keyboard, large color touchscreen Wi-Fi connectivity (802.11b/g), GPS for turn-by-turn navigation, 2-megapixel camera/camcorder, Bluetooth for handsfree communication and stereo music streaming Up to 5 hours of talk time, up to 250 hours (10+ days) of standby time Unlocked cell phones are compatible with GSM carriers like AT&T and T-Mobile as well as with GSM SIM cards (e.g. H20, Straight Talk, and select prepaid carriers). Unlocked cell phones will not work with CDMA Carriers like Sprint, Verizon, Boost or Virgin.