I like to figure out the fastest way to do things in my iphone so I have compiled these shortcuts which should work on an iPhone, iPad or iPod Touch, but there may be slight differences across devices.
Typing & Working with Text
|Type a period at the end of a sentence||Double-tap the Spacebar|
|Turn on Caps Lock||Double-tap the Shift key. The key turns blue to show its locked.|
|Open Magnifier (Loop)||Tap and Hold on text.|
|Type special character (like é or ñ)||Hold down a letter on the keyboard. A popup will appear with various versions of the character. Slide your finger to one.|
|Undo Typing||Shake the iPhone or iPod Touch.|
Safari (Web Browsing)
|Quickly get address bar back, or quickly scroll to top of page||Tap the Status bar at the top of the screen.|
|Zoom In/Out||Double-tap or Pinch Open/Close the screen.|
|Save images||Tap and Hold an image until some buttons appear. Tap Save Image. The image can be found in the Camera Roll.|
|Scrolling webpages||Use one finger to scroll the entire webpage. Use two fingers to scroll a frame on a webpage.|
|Delete Message||Delete Message|
Swipe Across a Message, then Tap Delete.
(Works in some other apps, not just Mail.)
Phone Controls & Calling
|Stop an incoming call from ringing.||Press the Sleep/Wake button.|
|Send an incoming call directly to voice mail.||Press the Sleep/Wake button twice.|
|Quickly access pause, volume, skip buttons, etc while in other apps, including the lock screen||Double-click the Home button.|
Swipe to the left (drag finger from left to right) to see the iPod controls and a Screen Orientation Lock.
|Take Screenshot||Press and release the Sleep/Wake and Home buttons at the same time. The screenshot is added to the Photo app’s Camera Roll.|
Force Quit, Reset, Etc.
|Force Quit an app||Hold the Sleep/Wake button until the red slider appears, then hold the Home button until the app quits.|
|Reset/Reboot.||Hold the Sleep/Wake and the Home buttons at the same time for 10 or more seconds, until you see the Apple logo.|
|Quickly scroll to the top (of a webpage, mail message, etc.)||Tap the status bar at the top of the screen.|
|Open Spotlight page (to do a global search)||Swipe to reveal the page (to the left of the 1st home screen) or press the Home button while on the 1st home screen.|
|Start Voice Control||Press and hold the Home button for a few seconds and Voice Control will appear. Then speak commands such as Call John Doe Mobile and it will make call for you.|