A method performed in a network server system of a service provider providing a service comprising media streaming. The method comprises receiving a detection message from a mobile radio device running the service for a user registered with the service provider, wherein the message comprises an indication that the radio device has detected that it is within a predefined geographical area. The method also comprises determining that the predefined geographical area is registered with the service provider and associated with one or more actions. The method also comprises electing an action of the one or more actions. The method also comprises sending an instructions message to the radio device, comprising instructions to modify the service such that the radio device performs the elected action.