The present disclosure relates to a mobile terminal device for a mobile telecommunication system. The device comprises means for receiving a telephone call, means for receiving packet-oriented radio signals, and means for selecting at least one transmission service which is transmitted using the packet-oriented radio signals. The mobile terminal device is adapted to receive a signal regarding a time slot from the network of the mobile telecommunication system, the time slot being determined in accordance with the selected transmission service. During the at least one time slot the reception of the packet-oriented radio signal is suspended in order to receive a radio paging signal which signals a telephone call addressed to the mobile transmission device so that the mobile terminal device remains accessible to telephone calls during reception of the packet-oriented radio signals.