I own one but I haven't put a sim card in it to test the actuall phone aspect yet.
My initial criticisms are:
- because each app is in its own jail, there is no way yet to set a global DNS setting like one can do on android
- there is no native mullvad VPN app
- all android apps are in the same sandbox, there is no out of the box way to have an android app isolated from others
- there is no work profile
- the gesture based ui is weird and id rather have more navigation options.