IPhone 4 With Straight Talk Having Problems (No service)?

So, I recently received my sim card in the mail for my iPhone 4 for straight talk. Everything worked at first, up in the left corner, I had service and full bars, and all of the sudden it stopped working and it now says "No Service"? When I restart my phone, it comes back, but then quickly goes away. Does anyone have a solution for this?

First of all you need to keep up your sim in a right position and jus check out whether its properly unlocked or not?

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