Abstract: A waiting time optimization for a caller of a called party having a number of telephone numbers is obtained by a device and a method for establishing a telecommunication connection from a caller to a called party via at least one telecommunication network, in which the called party can possibly be reached on a number of telephone numbers stored in the telecommunication network. A telecommunication connection between the caller and the called party is set up in each case successively attempted on the stored telephone numbers by dialing in each case one of the stored telephone numbers of the called party until a telecommunication connection to the called party has been successfully set up. When a telecommunication connection has been successfully set up, the telephone number of the called party on which this successful setting-up took place is stored in the telecommunication network.

Abstract: An apparatus and method for informing a first mobile wireless subscriber identity module which is signed on to a mobile wireless network about further mobile wireless subscriber identity modules that are likewise signed on to a mobile wireless network includes sending a mobile wireless short message to each of the further mobile wireless subscriber identity modules. Based on the delivery to a mobile wireless subscriber identity module of pertinent delivery information, the further mobile wireless subscriber identity modules that are likewise signed on in a mobile wireless network may be determined. A short message may then be sent to the first mobile wireless subscriber identity module including information about which of the further mobile wireless subscriber identity modules are currently signed on to a mobile wireless network.