Also, keep your devices in airplane mode and/or turn off the Wi-Fi function when you are not using them. Your cell phone may be set to automatically join networks, so turning off Wi-Fi will make sure you have control over which networks you join.
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When you first turn on your Android phone's Airplane mode, Wi-Fi and Bluetooth are turned off. You can change this setting to keep your wireless connections on, so you stay connected to devices like your smartwatch or Bluetooth earbuds. You can also turn your wireless connections off again.