Excerpt: Like the M600i, Sony Ericsson's P990i runs the Symbian 9.1 UIQ operating system. The device is huge but well designed. The numeric keypad is on a flip-down panel. When this is closed, the touch screen is disabled and the phone is set up for easy access to contacts and messaging using the directional keypad or thumbwheel. When it's open, the screen expands and more options are visible. It's a neat way to differentiate between phone and PDA modes.