As long as someone has the Joule app, they can connect to and control Joule with Bluetooth. If they want to use WiFi as well, you will have to disconnect from Joule first:
- Verify that Joule is plugged in and connected.
- Launch the Joule app and proceed to the main menu (tap the three horizontal lines in the upper left).
- Tap Settings > My Joules > [Joule name] > Disconnect Joule.
- Tap Okay to disconnect.
Watch the video below to see how it's done.