Extended area service
Encyclopedia
Extended area service is a telephony
Telephony
In telecommunications, telephony encompasses the general use of equipment to provide communication over distances, specifically by connecting telephones to each other....

 term that deals with calling a wider area beyond the exchange without long distance or toll charges. It can be a flat rate
Flat rate
A flat fee, also referred to as a flat rate or a linear rate, refers to a pricing structure that charges a single fixed fee for a service, regardless of usage. Rarely, it may refer to a rate that does not vary with usage or time of use...

, message or measured and also it can be zoned as well. Finally it can be optional or mandated by government regulations.
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