FAQ: XP3plus
No, there is no E911 application on the XP3plus. You will need to configure & use Sonim SOS, or a similar third party application. Sonim SOS is one of our SonimWare tools and more information can be found at www.sonimtech.com/products/sonimware/#SOS
No, the XP3plus does not support USB On the Go. No audio & power at the same time.
The headset (or really any audio accessory with a cable) acts as a radio antenna. Without it, the FM radio would not have any reception. Once the wired accessory is connected to the 3.5mm jack on the XP3plus, the FM Radio app will start up and you can scan for stations. Listening to the radio is then possible through the headset and alternatively also through the speaker.