These are things that you're just supposed to magically know but don't
BONUS: Put 6 apps in the bottom tray
Just discovered at Gizmodo HQ the iPhone and iPad default to hold 4 icons/apps in the bottom tray. But the iPad can store more!
By clicking and holding on any icon (just as you do to rearrange apps), you'll unlock each app's position. Then just drag any two additional apps into the bottom tray. Super handy.
For more information contact All About Jazz.
