2Throw the app off the top of the screen to close it.

3Throw any other open applications off the top of the screen to close them.

Why this might help

One or more of your open applications could be reserving so much memory that there's not enough memory left to do real work. Closing apps can free up enough memory so you can continue working.

T2. Turn your smartphone completely off and on

NOTE If the screen is off and you can't turn it on or if gestures don't work, skip to T3. Triple-toggle to restart.

1Press and hold the power button.

2Tap Power and then tap Restart.

Why this might help

Restarting your smartphone closes all applications, frees up all memory, and reinitialises wireless services (phone, Bluetooth® technology, Wi-Fi and VPN). A fresh start.

TIP An occasional restart can be good for your smartphone just the way a restart can be good for your computer. Every once in a while, restart your smartphone.

T3. Triple-toggle to restart

1Press and hold the power button.

2While still holding down the power button, slide the ringer switch three times.

Wait a few seconds for the restart to begin.

Or try this method for restarting your smartphone: 3-key restart: Press

and hold Option + Sym + R and then release the keys all at once. Give this method at least 10 seconds for the restart to begin.

Why this might help

Atriple-toggle or 3-key restart may be effective if the screen is off and you can't turn it on, or if gestures don't work. These restarts also close all applications, free memory and reinitialise wireless services (phone, Bluetooth® technology, Wi-Fi and VPN).

NOTE Because open applications are forced to close immediately during a triple-toggle or 3-key restart, some unsaved data may be lost.

186 Chapter 14 : Troubleshooting