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How to duplicate SIM cards detected by the supplier?

why can't you use the original and cloned sim card at the same time? How does the provider detect that both are trying to connect to the network? I read about authentication, but I'm still a little confused, and I need more specific reasons why this happens.

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Mobile network operators are launching a subscriber database, HLR .

Each SIM card has a unique identifier, IMSI . The HLR associates the IMSI with the subscriber, storing together the IMSI and subscriber data.

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http://en.wikipedia.org/wiki/Radio_fingerprinting

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