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HLR
The HLR (Home Location Register) of a mobile network is a central database that contains details of each of its mobile phone subscribers. It stores details of every subscriber such as MSISDN, IMSI and logged-in MSC. The HLR data is stored for as long as a subscriber remains with the mobile phone operator. The main function of the HLR is to manage the fact that SIM cards and phones move around a lot by receiving and processing updates on their position, sending subscriber data to the Visitor Location Register (VLR) if they are roaming and removing this information when they are no longer roaming in that network. In Mobile Number Portability environments, HLR lookups perform a key role in the correct routing of text messaging and voice calls.

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