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When you're connected to in-flight Wi-Fi or traveling without a data plan, you can still send text messages to iPhone-using friends. Just head to Settings > Messages and make sure Send as SMS is disabled, and that iMessage is enabled.

Here's another one you might only stumble upon. To find a specific text message, use the search bar at the top of the message interface. Don't see it? Pull down to reveal it, or tap the top bar.

When you're traveling, it's a good idea to find out which apps the locals love most -- especially public transportation apps. To see what locals are downloading, go to the App Store and tap Near Me at the bottom.

If you're watching your data usage, it's a good idea to use a feature introduced in iOS 7: cellular data management. With this tool, you can decide which apps get to use cellular data, and which apps can load only over Wi-Fi. Head over to Settings > Cellular to...

When the camera is active, tapping the screen sets the focus and exposure for that object. But, the moment the camera moves, these settings are lost. To lock the focus and exposure, tap and hold until you see a yellow bar appear at the top of the screen, Even if you...