To turn off spell check on iPhone (iOS4) ,
Go to Settings -> General -> Keyboard
Now set Auto-Correction OFF

Charging your iPhone in closed carrying cases may generate excess heat, which can affect battery capacity. If you feel that iPhone gets too hot when you charge it, take it our of carrying case while charging it.

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If you are at the bottom of a website, SMS, notes or email message and want to go to top quickly. You don’t need to come back all the way to top by scrolling. you can simply tap on the top of status bar to come back to starting of the window.