Samsung SGH-T519 - Manual (Page 59)

Section 5: Entering Text 55
Using T9 Mode
Section 5
Using T9 Mode
T9 is a predictive text input mode that allows you to key
in any character using single keystrokes. This text input
mode is based on a built-in dictionary.
To enter a word in T9 mode:
1. When you are in T9 mode, start entering a word by
pressing the 2 to 9 keys. Press each key only once for
each letter.