MCI Service Agreement and Rate Schedule - Consumer details of company plans, rate increases, and regulatory information. - http://consumer.mci.com/mci_service_agreement/res_index.jsp
AT&T Consumer Service Guide - Provides information and news about the rates, terms and conditions for consumer services and the AT&T Consumer Services Agreement. - http://serviceguide.att.com/ACS/ext/index.cfm
HowStuffWorks: Telephones - Explains how things and technical processes work. - http://www.howstuffworks.com/telephone.htm