Extremely Inconsistent
The classic definition of a buggy app. I used this religiously on Android devices and for some reason IOS does not like Hangouts. Sporadically the app does not allow me to take calls. It changes my settings behind the scenes and I have to remove and start all over again. I started with Google Voice to avoid text charges... Switched to Google Hangouts as Google Voice was long ignored now issues continue to recurr and now I must move on. Best wishes IOS users. Hopefully your usage of this app is more fruitful than mine.
Snacks75 about Hangouts, v21.0.0