Unveiling the Backbone of Mobile Connectivity: Understanding the Visitor Location Register (VLR)
The visitor location register (VLR) is a database which houses information about the subscribers whom have roamed within a mobile switching center’s (MSC) location area.
Visited Public Mobile Network
The Visited Public Mobile Network (VPMN) is the network used by a mobile subscriber while roaming outside of their Home Public Mobile Network (HPMN).