iPhone users: Do you find yourself typing the same thing a million times a day? Go to Settings > General > Keyboard and look for Shortcuts after you scroll down just a bit. Then just enter the phrase and appropriate shortcut, and the next time you type that shortcut the phrase will appear. This is particularly handy for things like BRB or your email address.
Private Browsing: "Want to make sure that your information isn’t getting sent out to the Internet via Safari? There’s a quick way to fix that: Go to Settings > Safari and then click the tab for Private Browsing. Now all of your activity on the web is top secret, so proceed at your own discretion."
Found an image on a website that you want to save? Hold down your finger on the picture for a second or two. A menu will slide in from the bottom of the screen giving you the option to Save Image or Copy it to the clipboard. Once it’s saved it’s in your Photo Library, ready for whatever you want.