Electronic switch for communication terminals with multiple SIM cards, and a communication method

摘要

An electronic separating filter (ESF) (1) has first (91) and second (92) retaining modules to hold first (911) and second (921) chip cards. The ESF is set up to determine a type of instruction from a protocol data unit (PDU) received from a mobile telephone via a module interface and to transmit PDUs to one or more of the chip cards by relying on the type of instruction detected. Independent claims are also included for the following: (a) A communications terminal/mobile telephone; (b) and for a communications method for communicating between a mobile telephone and chip cards.