When entering Web and email addresses, the iPhone soft keyboard saves a few taps with its .com key. If you are in Safari on the iPhone you can even skip this key altogether if the domain name ends in .com. Safari assumes .com if nothing else is entered. For example, to go to http://www.blakejmatthews.com just type in blakejmatthews and tap go.
What if the domain name doesn’t end in .com?
If you press and hold the .com key .net, .edu, .org, and .us will appear. Then, slide to the one you want and simply let go.
But wait—there’s more! If you’re creating an email, press and hold the dot/period key and you’ll access the same feature. (This may not work in all apps and Web forms as this is dependent on the developer.)