Communication with a plurality of public land mobile communication networks (PLMNs) without roaming agreements

摘要

The present invention relates to a method for enabling a mobile unit to communicate with a plurality of Public Land Mobile Networks (PLMN:s). The mobile unit is provided with an emulator arranged to emulate a Subscription Identity (SI) based on a set of International Mobile Subscriber Identity (IMSI) and Key identifier (Ki) provided to the emulator. The method is characterized in making a plurality of IMSI/Ki sets available to the mobile unit, preferably by transmitting said plurality of IMSI/Ki sets provided by a memory deposit to said mobile unit via wireless communication, and automatically changing the emulated SI during on-going communication by selecting an IMSI/Ki set from said plurality of available IMSI/Ki sets, providing said selected IMSI/Ki set to the emulator, and emulating an SI accepted by one of said PLMN:s.Through the inventive method, the mobile unit can be connected to any given PLMN, simply by providing the suitable IMSI and Ki to the circuitry means, which can then emulate an SI accepted by the desired PLMN.