You can easily turn off data roaming on your Android phone to prevent surcharges. Here's how to do it.

You can turn off data on an iPhone all at once, for specific apps, or by turning on Airplane Mode through the Control Center. Here's how to do each.

Turn Off Location Services The most common way phones are tracked is through location services. To block tracking, go to your phone’s settings and turn off location access. On Android, open Settings > ...