You can perform tasks that are important for customer service using HLR. Such as:
Customer base verification and updating
Statistics say that about 2/3 of all SIM cards in the world are inactive. SIM cards can be lost, closed, blocked or simply not used.
Getting detailed information about each number (telecom operator, activity, roaming)
You can segment the customer base by telecom operators and calculate expenses for SMS Marketing and Bulk Voice Calls more accurately.