The mobile phone we usually use either has a large screen and a small keyboard or a small screen and a large keyboard. There are very few phones with both a large screen and a large keyboard, like the iPhone. However, such phones make people who like to send text messages uncomfortable. A reasonable solution would be for the phone to have a large screen when reading text messages and a large keyboard when writing them. This phone has this function; its motion sensing technology can convert the numeric keypad from a large screen to large keys. This way, it meets the needs of people who want either a large screen or a large keyboard.