How to put sim card in iPhone 4
When I got my new iPhone 4, I eagerly took it out of the box and started to set it up. But I could not figure out how to get the sim card in the phone. It did not explain this in the instructions and I had to google for it.
1. Take a bent paperclip, or similar (or a sim eject tool if you have one).
2. On the right hand edge of the phone, you'll see the little sim card tray, with a small hole in it
3. Insert the bent paperclip into the small hole, and the sim try should pop out automatically
4. You can slide in your sim card, and push the tray closed
There's an image here on Apple's pages that might help you: