I also can't receive or make calls.
On receiving: Phone caller can hear dial tone, no notification on GOS phone
Making outbound calls with GOS phone (Google phone app): Instant 'Call Ended' - seems to be crashing somewhere
Making outbound calls with GOS phone app: 'Calling' splash screen appears, no sound, eventually times out without appearing to actually execute the call
NB: SMS message notifications appear to be working fine