Apple is known for loading its software with handy shortcuts and tricks to make your life easier. There are some hidden short cuts in iPhone too. You might have noticed some of them accidently, but there are more short cuts then you know. Let’s begin with button shortcuts for the headset. Check them out:
While not in a call, you can press the button once to activate iPod and playback your music.
When a call is ringing:
1. Press once to pick-up the call
2. Press twice to send the call to voicemail.
3. Press and hold center button for about two seconds to decline the call. You’ll also hear two low beeps that confirm you the call is declined.
While in a call, press once to end the call.
While you’re in a call and there is a second incoming call:
1. Press once to switch the calls and hold the previous call.
2. Press and hold the button for two seconds to ignore the new call.
While listening to music in iPod:
1. Press once to pause the song and press again to resume it.
2. Press twice to skip to the next song
3. Press three times to back to the previous song
One more thing: for the iPhone 3GS, the bundled headset also has volume control buttons. You can use the “+” and “-” buttons to adjust the volume, naturally. Plus, you can press and hold the center button to activate voice control, which is a new feature that comes with the iPhone 3GS.
Let’s continue with iPhone controls:
To switch to iPod: If you’re using a different application while you are listening music and you want to pause or skip a track, double tap Home to display iPod controls.
Control iPod when locked: If you need to change the volume, pause or skip tracks, double-tap Home and you can control the iPod app and see what track is playing.
Tap the title bar: Double-tap on the title bar where the time is displayed and you will jump back to the top on Safari. This also works with SMS conversations.
Make calls from Safari If you press and hold on the number on Safari for a couple of seconds, it will display in a pop-up window.
Quick delete button: You can simply delete items by swiping your finger across the right side of iPhone Email, SMS conversations or podcasts when in List view. However, videos are marked and deleted after the next sync.
Force to quit apps: If an app freezes, press and hold the Home button for around six seconds to force quit it.
Fix Caps Lock: With Caps Lock enable on (Settings > General > Keyboard), double-tap Caps Lock to fix it on or off. If it’s off, click and hold Caps Lock then slide over to a letter to capitalize it.
Take screen shots: Press Hold button while pressing Lock button. It will take a screen shot of your current viewpoint. This feature is especially handy when you’re trying to show people how to do something on their iPhone, such as configuring iPhone for your mail2web Mobile Email account. 
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{ 2 comments… read them below or add one }
Thanks, this is a great post to refer to again and again. It’s astounding when you think of all the work that must go into programming a smartphone.
These are helpful tips. Trying to learn all of them, or even most of them, is like studying for the SAT’s, though.