How to insert a sim card into an iphone a1387?

I received a gift iphone a1387. I already have the mini sim card but I can't figure out how to put it inside the phone. How do I open it?

So the a1387 is the iphone 4s. Here are instructions with pictures on how to do that:

http://webtrickz.com/how-to-insert-sim-card-in-iphone-4/

There's a small pin hole on the side of the phone, you need to push that in with a straightened out paper clip.

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