A method for mobile radio suppliers to provide or share or jointly use a
mobile radio access network is provided. Said method is characterized in
that a single radio access network (9; 12), which is operated according
to UMTS standard, cdma2000 standard, or GSM standard, for example, is
jointly used by several mobile radio suppliers. In order to do so, the
mobile radio networks comprise a common radio access network but separate
core networks. Preferably several PLMN IDs are transmitted by the common
radio access network and are made available to the user terminal for
selection. The inventive method allows a joint radio access network to be
made accessible to different mobile radio suppliers, a mobile radio user
selecting one of several transmitted preferably PLMN IDs and using
services (CS or PS) via the associated core network of the selected
mobile radio operator.