I have been using Google Fi for over a year now on my iPhone, but since moving the service was just not cutting it. I often found myself standing next to the door, window, or even in some cases on my porch in order to make/take a call. Also with the iPhone, I was not able to utilize Wifi calling so it kind of put me into a tough spot.
I think a lot of the issues with this were due to how Google Fi makes use of Sprint and T-Mobile cell towers, sadly on the iPhone it only utilized T-Mobile which is spotty here in Okemos, and well just about everywhere in the area.