Tool to decrypt/encrypt with T9 mode (predictive) for SMS text messages for (old) mobile phones or numeric keypads.
T9 (Text Message) - dCode
Tag(s) : Telecom, Substitution Cipher
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T9 mode should not be confused with Multitap ABC mode. 'DCODE' is written as '32633' in T9 but '3222666333' in Multitap.
T9 (Text on 9 keys) is a predictive text method based on a dictionary, used in (old) mobile phones to type text on a keyboard/keypad with only numeric keys
The decryption of the T9 is normally based on a dictionary where all the words have been previously encoded.
It is normally impossible to write a word that does not exist but the dCode T9 translator in brute-force mode will test all the possibilities of words.
Example: 22 = AA,AB,AC,BA,BB,BC,CA,CB,CC
This functionality allows creating or remembering phonewords for phone numbers avoiding digits 0 and 1.
The ciphered message is made of digits, if there are 1 or 0, these digits can only code spaces or punctuation.
The T9 had other proprietary trade names like iTap, XT9, LetterWise or WordWise.
The notions of SMS writing/language or texting or autocorrect are clues as well as old mobile phones like Nokia 3210.
Mobile phones have other typing techniques (not predictive), such as Multitap code (ABC mode). With the same keyboard, DCODE is written 3222666333.
A textonym is the name given to each word written in the same manner in T9. Textonym list
Example: COOL = 2665 = BOOK
The T9 patent is from 1985. The T9 was popularized with SMS texting on the first old compatible GSM phones (late 90s, early 2000), but today, with smartphones/iphones and their tactile interfaces and their complete keyboard, the T9 is disappearing but it can still be used to easily code secret messages.
Reminder : dCode is free to use.
The copy-paste of the page "T9 (Text Message)" or any of its results, is allowed as long as you cite dCode!
Cite as source (bibliography):
T9 (Text Message) on dCode.fr [online website], retrieved on 2022-09-30,