Methods and apparatus to implement an Internet multimedia sub-system (IMS) terminal are disclosed. A disclosed example apparatus comprises a first interface configured to receive a user identification from a user, a second interface configured to receive billing information from the user, and a session manager to identify IMS service provider based on the received user identification, wherein a fee to access the IMS service provider is charged based upon the billing information. A disclosed example method comprises receiving a user identification from an IMS terminal, receiving billing information from the IMS terminal, determining an IMS service provider based upon the user identification, and billing a service charge for use of the IMS terminal based upon the billing information.