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iPhone 5 Portable Genius by Paul McFedries

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Controlling Network Data

Your iPhone gives you fairly precise control over your network data. For example, you can toggle just the LTE data, all cellular data, data roaming, or all your iPhone antennas. The next few sections provide the details.

Turning off LTE

Using the LTE cellular network is a real pleasure because it’s so much faster than a 3G connection (which, in turn, is much faster than a molasses-in-January EDGE connection). If LTE has a downside, it’s that it uses up a lot of battery power. That’s true even if you’re currently connected to a Wi-Fi network, because the LTE antenna is constantly looking for an LTE signal. If you’ll be on your Wi-Fi network for a while, or if your battery is running low and you don’t need an LTE cellular connection, you should turn off the LTE antenna to reduce the load on your iPhone’s battery. Here’s how:

1. On the Home screen, tap Settings. The Settings app appears.

2. Tap General to open the General screen.

3. Tap Cellular. The Cellular screen opens.

4. Tap the Enable LTE switch to Off.

Turning off cellular data

If you’ve reached the limit of your cellular data plan, you almost certainly want to avoid going over the cap because the charges are usually prohibitively expensive. As long as you have a Wi-Fi network in range, or you’re disciplined enough not to surf the web or cruise YouTube when there’s no Wi-Fi in sight, you’ll be okay. Still, accidents can happen. For example, you might accidentally tap a link in an e-mail message ...

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