How to zoom in and out in iPhone 4S?

A couple of days ago I bought an iPhone 4S. But I have a problem. I can't find where's the coom of the camera. I want to capture photos but I don't see a zoom option. Also on the screen it appears a square but when I click it more than 2 times it opens the folder of the pictures. So can you help me to find the zoom?

You just pinch like any zoom on a touch screen. Pinch out to zoom out pinch in to zoom on (with 2 fingers) :-)

Put your thumbs on the screen when your camera is on and slide your thumbs out wards or put two fingers on the screen and slide them out on the screen
just takes a while to get used to hope i helpd

You have to zoom in with your fingers.

Use the pinch to zoom feature on the camera.

The iPhone 4s has dual touch technology. If you simply place two fingers on the screen and pinch/pull apart your fingers you can zoom in or out, just as if you were looking at a picture.while you are doing that a little bar thingy appears on the bottom with a slider button thing that you can slide back and forth to zoom in and out. It only works if you are taking pictures. You can't zoom if you are taking video. Hope this helps!

Pinch with your fingers and your dreams will come true