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The HLR is a network database used for permanent management of mobile subscribers within a PLMN. It is accessible from the 3G-SGSN and the MSC. The HLR has been enhanced to include UMTS subscription data and routing information.
The VLR contains all subscriber data required for call handling and other purposes for the mobile subscribers currently located in the area controlled by the VLR. The VLR supports a mobile paging and tracking subsystem in the local area where the mobile is presently roaming.