What is HLR?

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what is HLR?
I with a customer service representative because my SIM card is not working and after a long time of debate about why it is not working (he was trying to avoid my question) he told me there's a problem with the HLR. so I want to know what is that, and if it is easy to solve it ?

And thank you in advance.

Editor

Call Centre Helper

HLR is Home Location Register
The HLR (home location register) is a database mobile network operators maintain which contains each customer's international mobile subscriber identity (IMSI).

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