T9.txt < DELUXE ⇒ >

When you type 4-6-6-3 , the phone has to choose between "good," "home," and "gone." A well-optimized t9.txt contains thousands of words ranked by how often people actually use them. This is why "good" usually appears first—it has a higher frequency weight in the text file. The Technical Magic: How it Works

T9 - The Solid Signal Blog

Every digit from 2–9 is mapped to a set of characters (e.g., 2 = ABC, 3 = DEF). t9.txt