Under the current structure everyone is charged the same fee, but services received are not equivalent. The network backbone is a communal resource and requires that everyone participate in its funding because it is critical. If we base income on handsets we are placing ourselves in a precarious position in the long run because handsets will become obsolete. Change over the next few years is inevitable. We may want to base charges on handsets for the short term and revisit the topic in a year or so.
Telecommunications only comes as far as the building.
From the building to the wall plug is the responsibility of the department. Some institutions are moving to provide services beyond the backbone. It is unfair for the voice network to pay an inflated chunk of the cost of the network. A funding model should collect from all three data, voice and video. There are groups whose mission depends on a high level of service, i.e. those who provide services to students.