As you can see on the keypad, each
number from 2-9 corresponds to 3 or 4
letters. That
number can be any of those 3 or 4
letters, so 1 press of "2" corresponds to either an "A" "B" or "C". So
dialing 1-800-555-APPL would be 1-800-555-2775 (just an example). This is the same for all
phones, not just the iPhone.
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