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Home Location Register (HLR)

The ‘Home Location Register’ or HLR is a central database containing details of each mobile phone subscriber authorized to use the GSM core network.

Each mobile network has one HLR, although there may be many HLR servers creating a single virtual HLR. More precisely, the HLR stores details of every SIM card issued by the mobile phone operator. Each SIM has a unique identifier called an IMSI which is one of the primary keys to each HLR record.

An HLR also stores the following data about a mobile subscriber:

• Current servicing MSC
• Status of the subscriber
• Temporary handset error code if applicable
• Status – Valid/Invalid
• If the subscriber is available to receive SMS
• If there is an error code preventing SMS delivery
• If the number has been ported to another mobile network