Abstract: The present invention relates to a method for transfer of (voice) data of users of a service network for the purpose of communication over mobile networks, comprising the steps of: storing data about mobile devices of users and/or data about users in one or more first data files of the service network; transfer coordinated by the service network and/or by the service network itself of (voice) data which users wish to have transferred and/or data used to route and/or store the data; using one or more mobile networks to provide mobile network facilities for connecting the mobile devices of the users to the first service network, wherein the mobile devices, when they sign on to a mobile network, are signed on to each of the telephony networks as local devices for the network in question.

Abstract: The invention relates to a method for selectively informing at least one person in the case of an alarm condition of an object, comprising of producing successive images of the object with at least one camera, comparing successive images, establishing at least one communication connection with the person in the case an image differs to a predetermined extent from a previous image, and sending an alarm report to the person over this communication connection.