Some of these are more secret than others, but would be good to know if you have an iPhone.
The author says, “While most of these are in the iPhone User Guide if you dig around, I’d say they’re useful enough to deserve a mention in their own right. (By the way, most of these tips also work on the iPod touch.)”
A few of these depend on preference settings.
1. Quickly get to the first Home screen
2. Flip between pages by tapping
3. Instantly access iPod controls from anywhere
4. Keyboard trick #1: Quickly type a period and space
5. Keyboard trick #2: Quickly type a single number or symbol
6. Keyboard trick #3: Caps Lock
7. Keyboard trick #4: Hold down keys for more options
8. Save drafts in Mail
9. Jump to the top of the page
10. Customize the iPod dock icons
11. Quickly zoom out in Maps
Pinching to zoom in and out in the Maps app is pretty neat, but can be a bit fiddly if you’re, say, walking along holding your iPhone. You probably know that you can double-tap to zoom in quickly, but how to zoom out quickly? Easy: tap with 2 fingers!
12. Save an image in a web page or email
13. Access the scientific calculator
14. Scroll inside frames
15. Take screenshots
Get all the details here: http://mac.elated.com/2009/01/05/15-secret-iphone-tips-and-tricks/
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