Thumb keyboard
（重定向自Thumbboard）
![Slider mobile phone](/Images/godic/202502/16/HTC_Apache5946.jpg")
A thumb keyboard, or a thumb board, is a type of keyboard commonly found on PDAs, mobile phones, and PDA phones which has a familiar layout to an ordinary keyboard, such as QWERTY. The inputting surface is usually relatively small, and is intended for typing using the available thumbs, while holding the device.