1. How to bring flash on your iPhone
2. How to sync your iPhone with multiple computers
Normally Apple only allows to sync media content on your your iPhone with one PC at a time. Adding another computer will result in the following error message: “The iPhone is synced with another iTunes library. Do you want to erase this iPhone and sync with this iTunes library?” Andrew Grant provides an easy step by step tutorial to fix this. You can find the tutorial here
3. How to access the scientific calculator.
This is pretty easy. When you are using your calculator just rotate your iPhone into landscape mode and vuala.. you are now able to make scientific calculations.
4. How to take a screenshot.
By pressing the Home and “Power/Sleep” button simultaneously at the same time your phone will automatically make a shot of your actual screen and save it to the Camera Roll.
5.Force quit a frozen application
Holding (5-6 seconds) the Home button will just do that for you.