Abstract: In a multiple-mode communications terminal, such as a dual-mode analog/digital cellular radiotelephone, cumulative usage of communications units in multiple modes is measured for comparison to stored critical values of tariffs for each of the modes, and measures to control usage are initiated based on an economic efficiency of the multiple modes. More specifically, expenses incurred by a communications terminal that communicates with a first mobile radiotelephone system and a second mobile radiotelephone system are controlled by storing first and second critical values which characterize a tariff structure of the respective first and second mobile radiotelephone communication systems. Communications units used by the communications terminal are measured. An economic efficiency associated with use of the terminal to communicate with the first and second mobile radiotelephone communications systems is determined from the measured communications units and the first and second stored critical values.

Abstract: Communication units used by a communications terminal are measured, and an economic efficiency associated with use of the terminal is determined from the measured communication units and a stored critical value of a tariff of a communications system that is stored in smart card that is coupled to the terminal. Measures to control communications unit usage by the terminal are initiated based on the determined economic efficiency. The measures to control usage may include providing an indication, e.g., a visual or audible indication, of the determined economic efficiency to a user of the terminal. According to one aspect, a first indication of economic efficiency is provided to the user, e.g., a first icon is displayed, if the measured communication units are less than the stored critical value, and a second indication of economic efficiency is provided to the user, e.g., a second icon is displayed, if the measured communication units are greater than the stored critical value.