Communication network operators enforce a variety of calling restrictions on subscribers. One of the most common calling restrictions is to limit a caller to initiating only local calls because communication network operators typically incur additional fees to carry non-local calls. Subscribers that do not wish to incur additional fees for such calls can have their account restricted from making long distance calls.
Conventional systems enforce these long distance calling restrictions based on some portion of the calling and called party's numbers. Calls in which the calling and called party numbers have different area codes are typically restricted based on this difference in area codes. Some calls made within the same area code are not considered local calls, and incur additional fees. These types of calls can be restricted based upon the local exchanges of the calling and called party's numbers (i.e., the first three digits of XXX-XXXX).