A method and apparatus for mobile communication in multiple mobile
communications networks. Embodiments include installing a SIM that
includes at least one IMSI and at least one MSISDN in a mobile
communications device. The SIM is used to receive and place calls while
the user is in the user's home network and while the user is roaming in
another network. In various embodiments, one of a home MSISDN and a local
MSISDN is used.