A standard telephone keypad, with four rows of three keys each. The top row consists of 1, 2, and 3, with keys continuing down in order until the last row, which is usually *, 0, and ...

Predictive text is most useful on 12-key and 20-key phone keypads, but it can be used on QWERTY text keyboards as well. There are a handful of competing technologies, including T9 from Nuance ...

A standard phone keypad consisting of the numbers from 0 to 9 and including the signs "*" and "#". Alphanumeric keypads are an upgrade to those and are used to enter text as well as numbers.

A few things stand out about [Vijay]’s braille keypad for smartphones ... sitting on the back of the smartphone such that you hold the phone much as you often normally would.