Your iPhone automatically locks itself after a set period of inactivity. This saves battery life, makes unauthorized access to your iPhone less likely, and prevents butt dialing and the sending of nonsense text messages to random contacts. The default auto-lock setting is one minute; but if you find yourself constantly having to unlock your phone in the middle of using it, you may need to change the delay time.
To change the delay time, go to Settings>General>Auto-Lock. You can set your iPhone to lock after a delay of one to five minutes or never.
Keep in mind, the longer the auto-lock delay, the more likely your friends are to play one of these iPhone pranks on you while you are in the bathroom.
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