An electric current sensor comprises a housing, a magnetic circuit comprising a magnetic core, and a magnetic field detector with a detection cell, positioned in an air gap between ends of said core. The method includes displaying a screen image related to a first operating mode on the first display module, if it is determined that the mobile terminal has been rotated on a predetermined axial direction, switching the mobile terminal from the first operating mode to a second operating mode; and displaying a screen image related to the second operating mode on the second display module. The method also includes determining a set of one or more unavailable scrambling codes based on the first set and selecting a scrambling code for the repeater based on the set of unavailable scrambling codes. The plate has a locking arm release portion such that movement of the plate will contact the locking arm and move the locking arm from the first to a second position.