Why does my factory unlocked iPhone say 'Sim is invalid'?

So i restored my iphone and it all of a sudden would not let me activate it and would tell me my sim card is invalid? after it's been perfect for months. so i go to the apple store and the employee replaces my iphone and tells me to order a new sim card. so i do just that, and with the new phone and the new sim card it still would not allow me to activate my iphone, and it comes up with the message 'sim card is invalid' I really am so frustraded because it has been a week without my iphone and it's really not the time for it to shut down on me. -help would be awesome.

I would take it back to the Apple store.  Maybe the replacement wasn't an unlocked phone.

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    markytot wrote:
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