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December 5, 1998, is when it became mandatory to dial the area code on all local calls to or from Dallas.

In 1996, the 214 area code for Dallas split, with downtown keeping 214 and the suburbs and outer parts of the city switching to 972. At that time, it became necessary to dial the area code for calls from 214 to 972 or vice-versa, but you could still dial just 7 digits for calls within either code. On 1998-12-05, the split was erased and turned into an overlay, requiring 10-digit dialing for all local calls.

Up until some time around 1990, you could dial 7 digits for any local call to or from Dallas, even if it was in a different area code (for example, 817 "metro" numbers in Fort Worth or Arlington). However, that arrangement meant that many prefixes had to be reserved, since there couldn't be both an 817-265 metro prefix and a 214-265 prefix. Requiring the area code for local calls into a neighboring area code allowed those reserved prefixes to be used.

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