A method and apparatus for programming a cellular telephone with activation parameters. A cellular telephone to be programmed is connected to a computer via a communications interface. A user input device is provided to allow a user to provide programming information, including a cellular telephone type, to the computer. A visual representation of the cellular telephone type is displayed on a display monitor to allow the user to interactively verify the inputted programming information. Upon such user verification, the computer determines activation parameters and transmits the activation parameters to the cellular telephone. In accordance with another aspect of the invention, certain activation parameters are dynamically computed based on the user provided programming information. In one embodiment, the user enters a cellular telephone number to be assigned to the cellular telephone. The computer looks up a system identification associated with the cellular telephone number in a memory unit. Certain activation parameters are dynamically computed based on the cellular telephone number and system identification.