Phone Keypad Cipher Tap T9

Tool to decrypt/encrypt messages with a mobile phone keypad. Phone keypads allow you to write messages in several ways: Multi-tap, ABC code, T9 code, Vanity, etc. and can be used as a cipher.

Phone Keypad Cipher – dCode

Tag(s) : Telecom, Substitution Cipher

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The Multi-tap code is the name given to the telephone input technique that consists of writing a letter by repeating the corresponding key on the mobile phone keypad. For example: ‘2’ for ‘A’, ’22’ for ‘B’, ‘222’ for ‘C’, ‘3’ for D, and so on ‘CODE’ is written ‘222-666-3-33’. dCode has a tool for that:

T9 code is the name given to the prediction algorithm that uses a dictionary to guess the word the user is trying to write. For example: ‘2’ for ‘A’ or ‘B’ or ‘C’, ‘222’ for ‘BAC’ or ‘ABC’. ‘CODE’ is written ‘2633’. dCode has a tool for that:

Telephone keypad codes are the alphanumeric codes for writing text from the keys of a telephone keypad (old 10 or 12 key version). There are 2 modes that coexist but are incompatible: the ABC or Multi-tap mode on the one hand, which allows you to write a character by repeating a key , and the T9 mode on the other which uses a dictionary to avoid key repetition and achieve intuitive typing.

T9 has short numbers, whose length is equal to the letter number in the word. There is little repetition of the same digit. This is the fastest way to type SMS without abbreviations.

Example: MESSAGE=6377243

The ABC multitap has long numbers (much longer than the original word), with many repetitions of consecutive digits (successive presses on the same key). This is the quickest way to type text messages with abbreviations.

Example: MESSAGE=633777777772433

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Cite as source (bibliography):
Phone Keypad Cipher on dCode.fr [online website], retrieved on 2023-03-25,