Found these across the internet and thought I’d share a few:
Silence an Incoming Call – Four options for dealing with calls you’d rather not take (when you can’t or don’t want to hit decline):
- Press the power button once to silence the ringer; the phone still rings on the caller's end and then goes to voicemail.
- Press the volume button once to silence the ringer; the phone still rings on the caller's end and then goes to voicemail.
- Press the power button twice to send the call directly to voicemail.(Didn’t know about this one)
- Flip the switch to put all calls on silent, then go into Setting and turn off “vibrate”
- If you have a jailbroken phone, you can install “SBSetting” and use a vibrate toggle for even faster movement between completely silent and just vibrate.
Set the Camera as Your Instant-On App -- If you frequently grab the iPhone to take photos, set the Camera app to launch when you double-press the Home button. You must still use the Slide to Unlock slider to wake the phone, but then you can double-press the Home button to go straight to the Camera.
Open the Settings application, go to General > Home and tap Camera in the list of options. If you listen to music often, set the iPod Controls switch to Off; otherwise, a double-press of the Home button brings up playback controls while music is playing.
The Autofocusing on your 3GS Camera -- The iPhone doesn’t capture a photo until you release the shutter button. Instead of tapping the button to take a photo, press and hold the button as you frame your shot. On the iPhone 3GS, you can still tap the screen to set a focus area with the button held down. When you’re ready to take the picture, release the button. This technique minimizes camera movement because you don’t have to both press and release the button with your finger.
Scrub Playback in the iPod or Music app -- When you're listening to a song, podcast, or audiobook, tap the progress slider at the top of the screen to move to another section of the track. However, the combination of a relatively small screen, the size of most people's fingers, and sometimes lengthy media make this a coarse way of scrolling. What if you just want to back up a few seconds in an hour-long podcast?
Tap the playhead on the slider and then drag your finger down to scrub the playback at various speeds; the rate appears above the slider, such as "Quarter Speed Scrubbing." The farther down the screen you slide your finger, the more fine-grained control you have over moving the playhead.
Use the Clock App to Set a Sleep Timer -- If you enjoy going to sleep to music or an audiobook, a combination of two apps lets you do it with the iPhone.
- Open the Clock app and tap the Timer button.
- Set the duration of the timer.
- Tap the When Timer Ends button and instead of selecting an alarm sound, tap Sleep iPod.
- Open the iPod app and play your audio.
Great for making sure you are trying to be productive….I don’t know if this is the best tip, but I hadn’t heard of it before :)