It is provided an apparatus, comprising base station means adapted to provide a base station functionality of a visited mobile network; selecting means adapted to select a user equipment, which is operably connected to the base station means, to report a result of a predefined measurement to the apparatus, wherein the selecting means is adapted to select the user equipment only if a roaming information of the user equipment received from a mobility management entity by which mobility of the user equipment is controlled indicates that a user of the user equipment is subscribed to one of one or more predefined mobile networks.