Home Location Register is the main database of permanent subscriber information.
There can be one or more HLRs in a single Publinc Mobile Network. It depends upon number of mobile subscribers, capacity of the equipements, organisation of network infrastructure etc. One core information stored in a HLR, specially related to LBS, is the location of a Mobile Subscriber (MS). Thus it enable HLR to route calls to those subscribers managed by that particular HLR. IMSI (International Mobile Subscriber Identity) and MSISDN (Mobile Subscriber Integrated Services Digital Network Number) are two numbers stored in a HLR attached to each subscriber.
Other than that HLR stores following information.
1. Current Location information (VLR number)
2. GSM services subscribed or given
3. Call divert settings
4. Service limitations
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