Here's a cautionary tale of how things can break when an area code changes. Almost every major metropolitan area in the United States has already diced, or will soon dice, its area codes into smaller geographic zones with new area codes. Generally when this happens, if you dial someone who used to be in your area code but is now in the new area code, you dial only 10 digits (area code + seven digits) instead of dialing 11 digits (1 + area code + seven digits). The phone companies don't require the "1," even though you are dialing a different area code, so that customers don't think they're being charged for a long-distance call.
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