Invalid sim in Iphone4

Bismarkab

Honorable
Feb 3, 2014
1
0
10,510
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Hi, my brother brought me this iphone4 to me some weeks ago.
Unfortunately, when I place a Sim card in it, it always bring the message "Sim Failure" and then "invalid Sim".
Please, what can I do to do away with this problem?
Please help.
 

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