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What information can I get from an HLR lookup?

Primarily, performing an HLR lookup search will let you know whether or not a mobile phone number is active. For businesses updating their records, this can help to clean up databases and delete numbers that are no longer being used, resulting in cost savings by ensuring only valid numbers are targeted. HLR is also used to identify the current network that a mobile number belongs to for accurate billing and routing of SMS or voice calls, and identifying whether a mobile number is roaming abroad.