Identity Management for Mobile Devices

A subscriber identity module for use in a mobile telecommunications device and having a plurality of identities for use in a mobile telecommunications network, the subscriber identity module comprising a memory and a processor, wherein the memory comprises an identity management process for execution by the processor and an identity database, wherein the processor is adapted to:

• on triggering, initiate the identity management process;
• detect one or more parameters of a currently available mobile telecommunications network;
• in the identity management process, search the identity database wherein each record comprises an identity and additional identity information for each identity, wherein the additional identity information includes the one or more parameters;
• in the identity management process, select an identity when a first record comprising the one or more parameters detected is found in said searching;
• and
• in the identity management process, modify an active identity of the mobile telecommunications device to be the selected identity when the active identity is not already the selected identity.