Hi,
try removing your sim card and install it again maybe it is connected loose to the terminal.
if you have entered a wrong pin code 3 times and also entered a wrong PUK code more than 10 times,
that is one of the reason for sim blocked. you need to contact your operator customer service if that's the case if they can do something about it or you can request for another sim card.
hope i helped your problem...
don't forget to rate me... thanks...
john
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