Tired of the iPhone's default "Sent from my iPhone" signature at the bottom of every e-mail you send? If so, it's easy enough to change it to one more to your liking or get rid of it altogether. From the iPhone's home screen, tap on Settings --> Mail, Contacs, Calendars --> Signature.

If you don't see Signature right away, don't worry, it is located further down the page. A sweep or two of your finger and you'll see it.

Once in Signature simply delete all the text. Leave the text field empty if you don't want another e-mail signature. If you do, however, simply use the iPhone keyboard to type one in.