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In the US and Canada, area codes must have the first digit 2 through 9 and the second digit 0 through 8. Also, the second and third digits cannot be the same for a regular geographic area code. In the US, an area code never crosses a state line, with the sole exception of the tiny town of Hyder, Alaska, which uses area code 250 from the neighboring town in Canada. If you dial the prefix 1, then you must dial the area code; it is no longer possible to dial, for example, 1-555-0123 for a long-distance call in the same area code.

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Q: What are the rules for area codes?
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