Actually smartphones are really act like a computer. But there are still some limitation to be a really computer. So designer Jan Rytir has come out with this Mobile Internet Device (MID) concept where the device is a computer in a cell phone size and able to make a phone call.
The device has a dimension of 180 x 80 x 20mm and come with an ultra wide LCD touchscreen that boasts of OLED technology, a 47 buttons QWERTY keyboard, a trackball and powered by an Intel Atom processor.
In order to make the device more like a computer, it also have two USB slots, a microphone, an audio input, an SD card reader, stereo speakers and a docking connector. However it is still in a concept stage, but I predict it will replace the smartphone one day. Who knows.