[whitepoplar]

What are the downsides to using an MVNO such as Google Fi? As far as I'm aware, carriers are prone to de-prioritizing MVNO traffic to favor their own customers during periods of high congestion or emergency, but I don't know if all MVNO traffic is treated equally, or if certain MVNO carriers are de-prioritized because they pay less for "budget/excess capacity" network use.

[ppseafield]

I had trouble laat year in a couple of remote places using Google Fi. They use Sprint and T-Mobile towers. I believe e.g. if you have a contract with Sprint, you can roam on Verizon's towers. However, I was visiting an area (central NC) and I had zero service the whole time, even in town. I switched back to Verizon.

Google Fi also automatically connects you to known WiFi spots and sends your data over their VPN. The switching between antennas will kill your battery as well.

[russdill]

The reliability of the least reliable carrier can bring down the reliability average. Just yesterday I could not make any outgoing calls because of a Sprint outage. Luckily the Signal Spy app makes it easy to switch to another carrier.

It's nice in a way since if a carrier is having an outage, you can manually switch, but I like for stuff to just work.