A method for activating a location-based function, at least one item of position data is determined for the function as a condition for activating the function. A device in a wireless communication network examines at least one property of the network to decide whether positioning of the device (1) is conducted. Likewise, a system may provide a location-based function, for which at least one item of position data is determined as a condition for activating the function. A program in which the method is applied is also provided.