The iPhone OS is incredibly intuitive with a perfect touchscreen that supports multi-touch and one of the best virtual keyboards on the market. The new iOS 4.0 - on the iphone 4 and available to iPhone 3GS - added multitasking to its capabilities.

Top Features - Excellent touchscreen keyboard, good looking web browser, and universal spotlight search, which searches your entire phone & music collection

Best for - The iPhone is still one of the best web phones around, and is unsurpassable when it comes to apps and mobile gaming.

Best Buy - Despite the signal issues that have been widely documented the iPhone 4 is the slickest iPhone yet, with a five megapixel HD video camera and support for Apples iMovies video-editing app.