The invention refers to a device for collecting biometric data, in particular fingerprints, the device having an optically active detector for recording the surfaces of body regions. In an embodiment of the invention, a Mobile Positioning Center caches location information regarding the mobile device. A plurality of response signals, representing magnetic resonance signals arising from the precessing nuclear spins, are simultaneously obtained from the region respectively with a plurality of RF reception coils, with each response signal representing a reduced data set of a totality of all of said response signals.