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SIM300 based modem and new SIM

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Serendip12

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Hi,
Until recently I was using a Uninor SIM card and used to work fine.
Uninor has shut down operations and I had to switch to another provider.
When I use the new SIM card, I get a message SIM not inserted.
When I put the old (uninor) SIM, it is recognized. But doesn't recognize the new SIM.
What could be wrong?
Much appreciate your help.
 

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