You guys are missing the point. Of course the numbers in the keypad make the tones too, but he needed to spell something out to an IVR or Voicemail system using touchtones.
To do that, you need to know what letter is associated with each number on a standard DTMF keypad. Hence, the need to use the on-screen dialpad (which displays the number keys with their letters just like a standard touch tone phone) |