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Short answer: because you live in an area code overlay in a state that does not have "toll alerting."

Long answer: In an area code overlay, two or more area codes serve the same geographic territory. Two phone lines, even at the same address, could have different area codes. To minimize confusion as to which number you will reach if you dial just 7 digits, and to provide a "level playing field" for new competing local phone companies (more likely to have numbers in the new area code), you have to dial the area code on all calls. However, since you live in an area that does not have "toll alerting" (local calls can be dialed without '1' but all toll calls must be dialed 1+), you have to dial 1 plus area code plus number for all calls.

All of Canada and most of the United States has toll alerting, but there are several large states that do not, including California, New York, and Illinois.

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Q: Why do you have to dial 1 plus area code for all outgoing calls?
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When do you need to use an area code?

When dialing a number outside your own area code, you typically must dial the area code. In some areas, you also must dial the area code for all toll calls, even within the same area code. Also, in overlay areas you must dial the area code for all calls.


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