You can control FMD (and thus your phone) either via SMS or via FMD Server (server can be self-hosted too). You send a command to the phone (e.g. “fmd ring”) and the phone executes it.
Features:
- Locate the device (using GPS or cellular location)
- Lock the device
- Let the device ring
- Take pictures with the device’s camera to see its surroundings
- Factory-reset the device
As they advise, it is better to install the app through the F-Droid store so that you get updates when they come out.