Asus Padfone is not a mobile phone. it's a combination of a phone and a tablet computer. so they have used the perfect name for it, the padfone. actually this is not a single device, it's a combination of two devices. it consists of detachable Android phone and a tablet computer. this android phone has a 4.3 inch display and can be integrated with tablet.
the tablet has a 10.1 inch Capacitive touchscreen and an accelerometer sensor to auto rotate the UI.
the Asus Padfone has 1GB internal memory and supports up to 32GB memory cards. it runs with Android 3.0 Honeycomb OS and comes with lots of tablet specific Android apps. Asus Padfone has both wi-fi and bluetooth as well. it has a built in 5MP camera which supports 720p video recording and geo-tagging.
unlike other tablet computers, Asus Padfone has a built in GPS receiver which support A-GPS. it also has a digital compass for better navigation features. they haven't released this to the market yet but it will cost around $550.