Reasons to need to know the numbers/alphanumerics DURING a call.

Scenario 1:
Me: (Dialing Company X on my BB 8700g)
Company X: (Automated System) "Thank you for calling Company X. If you know the extension of the person you are trying to reach, please enter it now. If you don't know the extension, please press 1."
Me: (Pressing 1)
Company X: Please spell the last name of the person you are trying to reach using your touch tone keypad.
Me: Ummmm. (Not remembering the alpha keypad and wishing I some handy diagram of the numbers and corresponding letters...)

Scenario 2:
Me: (Using my company voicemail system and just completing an outgoing message)
Company Voicemail system: Please enter the mailbox number. To enter a name, please press "pound".
Me: (Press pound)
Company Voicemail system: Enter the last name first
Me: Ummmm. (Not remembering the alpha keypad and wishing I some handy diagram of the numbers and corresponding letters...)