Iphone 4 problems- How to adjust zoom on screen?

My iphone 4 is zoomed in. Everything on the screen is zoomed in and I can't see the whole user interface. I'm trying to zoom out so that I can see everything on the screen but I can't. I don't even know how this happened. Any advice on how to fix it?

Use all 5 fingers and double click on the screen. If that doesn't work, use the same 5 fingers to zoom out like you would any other time.

Click the home button three times in a row.

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