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The letters were mapped to digits in order for people to dial the letters. But number 1 and 0 was reserved for long distance calls and operator, respectively. They could therefore not be used in the prefix. Therefore, the numbers 2-9 was used to map letters and number.
These letters have been used for multiple purposes. Originally, they referred to the leading letters of telephone exchange names. Sometimes businesses advertise a number with a mnemonic word having more letters than there are digits in the phone number.
On a telephone dial every single letter of the alphabet appears, from A to Z. There are two numbers however on a telephone dial that aren't associated with any letters. Those are 1 and 0.
These were the hubs through which an area's calls would be routed. Phone subscribers were given a unique five-digit number within their service area. These would be preceded by two digits which were identified by letters that denoted the telephone exchange you were connected to.
You can easily tell whether a rotary phone would still work. The dial mechanism generates pulses, the number of pulses being the same as the digit you are dialing. If you can dial by tapping the switch hook, then a rotary phone would work. A rotary phone would work with some telephone systems, but not all.
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.
Dialing the Extension Directly Modern cellphones provide users with a way to dial an extension number directly. To accomplish this, you first enter the primary telephone number you are calling. After you do this, insert a comma after the primary number by holding down the * key until the comma appears.
Instead of just keying the numbers for you, a pop-up will appear on the screen with extension, asking if you should send it now. It will remain on the screen while in the call until you decide to send the extension or cancel. To use wait, enter the number like this: 1-555-555-1234.88 -- where “88” is the extension.

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