iPhone keyboard tricks
Learn settings that turn off the annoying autocorrection, as well as make typing URLs easier.
Does the iPhone spell check drive you crazy? !
Go to Settings, then General, then Keyboard and turn off autocorrection. You can turn off autocapitalization, too.
Watch this: iPhone 3GS keyboard tricks
Also while you're there, you can turn on or off the option for a caps lock key and turn on or off the option to make double tapping the space bar type a period--good for typing Web addresses quickly.