Abstract: There is described the controlling of a multiple subscriber identity arrangement comprising a modem (10), and a control unit (13) associated with the modem. The modem is capable of receiving messages related to at least two subscriber identities, but not simultaneously, and comprises a listening block (11) capable of monitoring at least one signalling channel associated with the second subscriber identity. The control unit (13) is configured to interrupt ongoing communication activity on the first subscriber identity during at least one signalling occasion (41,42,51,52) associated with the second subscriber identity and cause the listening block of the modem to monitor the signalling channel associated to the second subscriber identity during said occasion.