4.5 Brilliant phone but needs user input FluidUK | 07/01/2011 | See all FluidUK's reviews (2) ok calm down you guys, the phone has windows 5 or 6.5 operating system, agreed its not to good out of the box. The hardware on the phone is fantastic and you wont find a phone to match these specs for this price! The screen is just awsome so is the camera. So what do you do?You flash an unofficial rom, even android roms are available now, all you need to do is research beforehand because the phone needs to be loaded with flashing utilities. google "xda hd2 leo forum" you have a large hd2 community backing up this phone.