[RubberbandSoul]

> can’t make regular calls over cellular

That's extremely serious because the call you're trying to make could be an emergency call. A bug like that would have top priority in the org I used to work in. If I'd had to guess it cancels the call because there's a crash in a process somewhere. Possibly because of audio handover between apps.

[fmajid]

I did a MS in Telecoms Engineering. Our Telephony teacher Claude Rigault drummed it into us that when people can't make emergency calls, pople die, thus the importance of reliability.