Method for restricting or preventing a service in a mobile phone network

The present invention relates to a method for restricting or preventing of a positional service outside a predetermined area. To the system for carrying out the method belong a mobile station network (1) and a terminal device (2) comprising a mobile station (3) and a dock station (4) to receive the service from the mobile station network. The location area of the terminal device is monitored preferably based on the measurements performed by the mobile station, and on the grounds of the monitoring the use of the service is restricted or prevented outside the predetermined area.