Editing Seven-digit dialing (section)

==Limitations==
Area code [[overlay complex]]es introduced the requirement that calls must include the area code, resulting in a [[ten-digit dialing]]. Seven-digit dialing remains possible in some areas of North America with a single area code.

Traditionally, calling from one area code to another, specifically for [[long-distance call]]s, requires the caller to dial the trunk digit "1" before the code and number. More recently, with the increasing number and decreasing geographic size of area codes, it is increasingly possible to dial a number in another area code that is not long-distance where such a call does require the area code, but not the trunk digit (initial "1").

Many modern [[mobile phone|cellular phones]] automatically prepend the telephone's own area code if the user enters only seven digits, sending a total of ten digits. This is the same case with many [[landline]] providers that allow this. And also with many [[voice-over-IP]] services, users can configure default handling of seven-digit dialing in a [[dial plan]].