You are either misremembering, or misinformed. T9 was not a dialing method, it was a texting method. You didn't call MOM by punching 666. There was no intelligence or predictive capability in those old phones. You texted by using the 10 key pad and the positions of the letters under each number. You paused between letters. If you wanted to text the word MOM, you hit 6 666 6. The center 666 is because the O is the third letter under the number 6, MNO. If you wanted to text the word JOHN you had to input 5 666 44 66. Does this seem slow? Yea, but 9.6Kbps wasn't fast either, and there were those (mostly teenage girls) who could T9 with the phone under their desks.
If Apple has added some predictive capability to the keypad that helps you narrow down contacts just hitting the number keys, cool, but that's not T9.