Keyboard (external) Wikipedia DTMF identified where you were calling Telephone Keypad DTMF far predate T9 A Wikipedia article: number - letter correspondences of telephone keypads Keyboard (external) http://en.wikipedia.org/wiki/Telephone_keypad English http://en.wikipedia.org/wiki/Telephone_keypad English http://en.wikipedia.org/wiki/Telephone_keypad w:Telephone keypad#Letter mapping identified where you were calling far predate T9 traditional keypads http://en.wikipedia.org/wiki/Telephone_keypad Touch Tone Keypad Telephone keypad identified where you were calling telephone keypad English history of the telephone keypad Telephone keypad Keyboard (external) DTMF w:Telephone keypad#Letter mapping Keyboard (external) English Telephone keypad Wikipedia Telephone Keypad traditional keypads Keyboard (external) http://en.wikipedia.org/wiki/Telephone_keypad Keyboard (external) Keyboard (external) http://en.wikipedia.org/wiki/Telephone_keypad