Going Windows Mobile Samsung's SGH-i300 is based on the new Windows Mobile 5.0 operating system. According to Samsung, the SGH-i300 is also the first device using Microsoft's mobile OS to feature a hard drive. Credit: Samsung Related stories: Microsoft hits redial in cell phone battle iOS 13 comes with new Siri voice, dark mode, privacy features: All the new software Apple will soon deliver to your iPhone. Best power banks and battery packs for Android devices: Looking for a pocket-size power bank for charging your Android smartphone on the go? Here are some top picks.