The fair condition Samsung I637 Jack has easy to use controls. This PDA phone is also unlocked which allows users to switch SIM cards whenever they want to. This phone is powered by the Windows Mobile 6.1 OS which provides users with a plethora of services and features. Users can access Windows Live, Yahoo!, AOL, Microsoft Outlook mobile, and Windows Media Player 10. these accessible features add value to your mobile experience. buy this unlocked Samsung I637 Jack and get a good deal.