Data communications services Data communications services from service providers (including telecommunications common carriers). It includes transmission channel (can include twisted pair, fiber-optic, coaxial and wireless), equipment, access, and usage charges, installation, relocation and directory charges, but excludes equipment purchased or rented from a third party. It includes costs for smart phone (e.g. Blackberry) usage that combine voice and data services. It includes non-voice enhanced services such as internet access, electronic mail service, electronic messaging services, electronic document exchange services, etc.