Well, now Update #19 is out.
In the video they are making an emergency call... I hope that the antenna was attached to a network simulator with the device being registered on it and not on a live network
Based on the status bar of the main screen, they had no network coverage at all. I'd guess that's why they were dialing an emergency number, as the Cosmo otherwise probably wouldn't even have botherd trying to making a call, while dialing an emergency number probably forces any smartphone to try anyway, while looking for any network. As the text of Update #18 points out "that the Cover Display is operating in debug engineering mode", it could also be that the Cosmo didnn't actually try making any call, and that 112 was a simple number to dial in the demo.
Were they to dial any other "real" number, at least some of us would certainly try calling that number, just to see who, if anyone, would answer. Since Planet Computers, as far as I know, have no published phone number, they'd need a burner phone or a network simulator, and also make VERY sure nobody actually has, or might soon get, any "real" number they'd dial. Since "everybody" knows what 112 is, I'd guess it's convenient for that reason too, as long as they don't actually dial it for real.
