A method and apparatus for controlling a second mobile device in response to a first mobile device having no connection to a telephony service. In response to receiving a first control signal including the first unique identifier and from the telephony service, the first unique identifier is used to identify the first group. The data is targeted to the first mobile device. In response to the first mobile device not being connected to the broker service apparatus and the second mobile device being connected to the broker service apparatus, a second control signal, which includes the identifier of the first mobile device, is issued to the second mobile device in order to forward the data to the second mobile device.