T9.txt «Top 100 ORIGINAL»

If you grew up in the late '90s or early 2000s, you remember the "thumb workout." To type a simple "Hello," you had to tap the 4 key twice, the 3 twice, the 5 three times, the 5 three times again, and the 6 three times. It was called multi-tap, and it was a nightmare.

T9 - The Solid Signal Blog

The T9 system, developed by Martin King, Dale Grover, and Cliff Kushler , uses a few clever tricks: t9.txt