What iphone app crops text messages/photos?

What app on the iphone can I download to crop text messages…

For example if I want to send someone a screen shot of a text message but only want one text bubble to show… I tried downloading some apps but it only crops half the picture and doesn't let me adjust the crop to the size that I want.

The stock Photos app editor can do that.

If you have ios7, you can use the stock photo app by clicking edit in the corner.

If you have ios <6 I used to have photogene. It works good.

You don't need an app. The standard Photo app can do it. Tap on Edit in the upper right corner, then use Crop to crop out the parts of the image that you want to remove, then Save to save it.