The ancients, struck with this irreducibleness of the elements of human life to calculation, exalted Chance into a divinity; but that is to stay too long at the spark, which glitters truly at one point, but the universe is warm with the latency of the same fire.
A visitor location register (VLR) is a server in a cellular network that supports roaming functions for users outside the coverage area of their own HLR.
For an example when one subscriber move from one VLR area to another area their locations are updated in the VLR and new VLR information is updated in the HLR. But if a subscriber moves within the same VLR area no such interaction with the HLR is needed. Both HLR and VLR store the subscriber information as per the GSM architecture to provide mobile communication services to subscribers registered within the network.