Iphone

1. Scroll to top

Tapping the status bar (the bar at the top with the clock) will make scrollable content scroll to the top. It comes in handy in situations like when you’ve scrolled down a long web page or mail message and you quickly need to get back to the top.

2. Screenshots

Simultaneously press the Home and Sleep/Wake buttons to take a screenshot of your current screen. You’ll hear a camera shutter sound, your screen will flash white, then the screenshot will appear in the “Saved Photos” library of the Photos app.

3. Saving images in Safari and Mail

Touching an image in Safari or Mail for a couple of seconds will present you with an action sheet which will enable you to save the image. As with taking screenshots, the image will get stored in the “Saved Photos” library of the Photos app.

4. Caps lock

Double-tap the Shift key to lock it.
This one’s actually somewhat intuitive but I was surprised by how many people aren’t aware of it.

5. Extra keys

Do you need to type an umlauted-u (ü) but you’re not using the German keyboard? Touch and hold the U key and you get a set of additional keys to choose from.
This works for several of the alphabetic keys, enabling you access to letters such as éîçåß, etc.

6. Lock / shut down / force quit / reset

To turn your phone completely off, press the Sleep/Wake button for a few seconds then drag the red slider that appears.

And finally, if your phone seems to be completely frozen where attempting to turn it off or force quit the current app does nothing, you can force a reset of your phone by pressing both the Sleep/Wake and Home buttons for at least ten seconds. Note that while Apple technically calls this a “reset”, it’s actually more like a “reboot” and none of your settings will be changed.

 

7. Home button options


A very underused, yet convenient feature is that you’re able to set the function for double-clicking the Home button. By default, this just brings you to the Home screen, meaning no different function than clicking the Home button once.
But if you go to the Settings app then navigate to General then Home Button, you’ll find a few handy options. I have mine set to go to my Phone Favorites but you can also set it to open the iPod app, or just show the iPod controls when music is playing.

8. Swipe to delete

In the Mail app and many others that use lists of items, you’re able to quickly delete an item by swiping your finger across the item… sort of emulating crossing something off a list. Doing so exposes a Delete button so that you’re able to confirm your action.

9. Register your Wi-Fi

Skyhook WPS is the service that, via Wi-Fi, enables your iPhone and iPod touch to locate where you are if GPS isn’t available. It generally gets you more accuracy than the cell tower triangulation method. The big issue with this method, though is that if the router that you’re currently connected to isn’t in the Skyhook database, you’re out of luck.

10.Keyboard Speedups
Don’t bother using the Shift key to capitalize a new sentence. The iPhone does that capitalizing automatically.
Don’t put apostrophes in contractions, either; the iPhone will put those in for you, too.

11.- Stopping incoming calls
To stop an incoming call from ringing, press the sleep / wake button. To send the call immediately to VoiceMail, press the sleep / wake button twice.

12.- Surfing Internet while talking
iPhone: You can get on the internet DURING a call! You can only do this if your connected to a WIFI network (it wont work via edge), just hit the home key and click on Safari. Now your surfing while talking! The person on the other end can’t hear the keyboard clicks either!
  
13. Tapping on the address in your contacts opens it up in Google maps.

14.- Safari Tricks
When you’ve scrolled down to the bottom of a page, and you want to go back to the top- just tap on the top bar of the phone (where the Rogers or Fido and the time is) and the page jumps right back up to the beginning

15.- To email a page to someone tap on the address bar. The Share button on the top left will create a message for you!

16.- Page down. 
When not using a zoomed-in display, double-tap towards the bottom of the screen. The page will re-center around your tap. Make sure not to tap a link!


17.- Zoom onto a single picture.
Double-tapping images in Safari zooms them to fit your iPhone display. If the picture is linked to a URL, this can prove a little tricky but it works great for non-linked images. Double-tap again to return to the unzoomed display.


18.- Zoom a column.
You can zoom text columns as well as pictures. Double-tap on the column to fit it to the display. Double-tap again to return out of the zoom. Not only does Safari zoom block-quoted text independently of regular text but if you move your finger after the first double-tap-to-fit, it interprets the next double-tap as a re-center page command rather than a return-to-previous-zoom. Smart.

19.- Stopping a scroll.
After flicking a page to get it to scroll, you can tap the page at any time to stop that movement. Don’t forget, you can also manually drag the screen display to reset the part you’re viewing.

20.- You can type a website address without adding the ‘.com’ just like on Safari on a Mac.

21.- Examining the URL.
To peek at a link’s destination, touch and hold the link for a few seconds. You can also do this with images to see if they are linked. If a link appears and you don’t want to activate it, just slide your finger away until the destination text disappears.

22.- Hide SMS preview
With Show SMS Preview disabled you will only get a generic "New Text Message".
Go to "General -> Passcode Lock" and enter a 4-digit passcode. After that disable "Show SMS Preview".

23.- Access the Scientific Calculator
Not many people know that you can get advanced features with your calculator simply by turning it sideways.
You can turn it either way (left or right) and you’ll see the calculator go into landscape mode where you see your extra features/buttons.

24. - Access iPod controls or phone favorites instantly
Go to "Settings -> General -> Home Button". Double taping the home button goes to "Home", "Phone Favorites" or "iPod Controls".

25. - Forward/rewind music & video
Press and hold the skip forward/back arrows to fast forward or rewind rather than skip tracks. Also, press on the album art to manually FF/rewind.

26. - Use iPhone as a Modem
You can use iPhone 3G or later as a modem to connect, or tether, your computer to the Internet. You can connect iPhone to your computer using the Dock Connector to USB Cable, or via Bluetooth.
In Settings, choose "General -> Network -> Internet Tethering".
Slide the Internet Tethering switch to On.
Connect iPhone to your computer:
USB: Connect your computer to iPhone, using the Dock Connector to USB Cable. In your computer’s Network services settings, choose iPhone. On a Mac, a pop-up window appears the first time you connect, saying "A new network interface has been detected". Click Network Preferences, configure the network settings for iPhone, then click Apply. On a PC, use the Network Control Panel to configure the iPhone connection.

27. - Keyboard ShortcutsDouble-tab the SPACE bar to add a period followed by a space.

28. - Safari Tricks.
You can type a website address without adding the ".com" just like on Safari on a Mac.

29. - Control iPod when locked
If your iPhone/iPod touch is locked but 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.

Some of this content was taken from http://iphonenews.desinformado.com/2008/01/1000s-iphone-tips-and-tricks-1-100/