I need to crop my square picture into a circle?

I have a iPhone and I have a square picture and I need it to be a circle. No square behind it, just a circle! If there are any IPHONE apps that will do this for me please let me know!

You can't crop an image to a circle. All images are square/rectangular. They have a height and width in pixels.
All you can do is select a circle, invert the selection, delete outer parts to transparency and save as a PNG or GIF (both of which support transparency). The image will still be square/rectangular. Here's an example: I need to crop my square picture into a circle
You can't do it on a Phone. You need a computer with an image editor which supports transparency and exporting images as PNG and GIF.

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