Quick tip: Preserve your iPhone battery for that important call

Sometimes you need a plain old phone more than you need a smartphone. But with all the social, location and notification apps you have loaded and running on your iPhone(s aapl), your battery may not hold out when you need it most.

Placing your iPhone in Airplane mode will maximize the life of your battery for listening to your music, watching movies or playing games, as it disables all network and cellular services. But that’s an extreme solution, so check out the following general tips for making that last 10 percent of juice last as long as you need it to:

  • Under Settings > Brightness, disable Auto-Brightness and adjust brightness down to a tolerable level. Especially if you’re not using your device for lengthy reading sessions, you should be able to get away with a fairly dim display.
  • Under Settings > Location Services, turn off Location Services. Note that apps that use location like Maps won’t be able to find you if you do this.
  • Under Settings > Wi-Fi, turn Wi-Fi off.
  • Under Settings > General > Network, turn off Enable 3G and Cellular Data.
  • Press the Home button twice (quickly), press and hold any app’s icon in the tray that appears, then tap the red “x” to shut down running apps.
  • Under Settings > Notifications, turn off Notifications.
  • Under Settings > Phone, turn off FaceTime.
  • Under Settings > Sounds, turn off Vibrate, Lock Sounds and Keyboard Clicks.
  • Power off and then power back on your iPhone.

Even if you do all of the above, you’ll still be able to make and receive phone calls, as well as send and receive SMS messages. Data services are required to review your visual voice mail list, however, so you’ll need to call your voice mail box manually to retrieve messages. But if you find yourself in a situation where your battery is approaching or already into the red zone, and you need it to stay on for at least a couple more hours, this is the way to make sure that happens.