Samsung Galaxy 551 I5510 Unlocked Phone with Android OS, Slide-Out QWERTY Keyboard, 3.2MP Camera and Wi-Fi-Unlocked Phone - International Version - Black This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile. Not all carrier features may be supported. Samsung I5510 works on GSM 850/900/1800/1900 MHz frequencies. 3.2 megapixel camera with auto focus, multi shot, self-timer, panorama, scenes and video capture. Music and video player with FM radio, supports MP3, AAC, AAC+, eAAC+, MPEG4, H.263, H.264. Full slide out QWERTY keypad; Email and messaging enabled. It will not work with CDMA carriers like Verizon Wireless, Alltel and Sprint This unlocked cell phone is compatible with GSM carriers like AT&T and T-Mobile. Not all carrier features may be supported. It will not work with CDMA carriers like Verizon Wireless, Alltel and Sprint This cell phone may not include a US warranty as some manufacturers do not honor warranties for international version phones. Please contact the seller for specific warranty information.