Systems and methods for using services when roaming internationally using proactive commands

摘要

Embodiments of the present disclosure relate to a user terminal [110] using at least one service during international roaming or when leaving international roaming. According to a preferred embodiment, a method of automatically switching IMSI when entering international roaming or leaving international roaming using a proactive command such as a PLI command is disclosed regardless of a cause code received from an operator. The method includes changing the home IMSI of the user terminal [110] to a global IMSI when at least one network parameter corresponds to the second location, and when the at least one network parameter corresponds to the first location, the user terminal [ 110] and changing the global IMSI to the home IMSI.