Dynamic identities in a mobile device

A computer-implemented method of selecting an identity profile, comprising:

• receiving a plurality of identity profiles from a server system;
• storing said plurality of identity profiles in a storage means;
• selecting a first identity profile from said plurality of identity profiles;
• transmitting authentication information to a mobile communication network in order to use said mobile communication network, said authentication information comprising an identifier from said first identity profile;
• detecting an identity change event;
• selecting a second identity profile from said plurality of identity profiles upon detecting said identity change event;
• and
• transmitting further authentication information to said mobile communication network or to a further mobile communication network, said further authentication information comprising an identifier from said second identity profile;
• and
• selecting a new cell on said mobile communication network or said further mobile communication network before transmitting said further authentication information to said new cell in order to prevent location pinpointing, said new cell being arbitrarily being selected from a plurality of cells.