I was using Google Fi on a OnePlus 6t with no issues and was happy with it, with the exception of poor rural service compared to Verizon. I bought a new Pixel 4a and thought that it would be a similar experience to the 6t with dual sims, a Verizon and a Fi, if not better as it is meant for Fi. I bought it just before going to Mexico and did not fully test the dual sim dual standby functionality and when I got to Mexico everything went to shit. Setting data to the Fi, I would often not receive calls. Setting data to the Verizon sim, I would never receive calls. Turning all data off, I would not receive calls. My connectivity was limited to being on wifi. Outgoing calls on the Fi sim while not on wifi, would show up as an Austrian +43 number to the receiver. I have no idea how that happened and Fi support was not helpful, but would be curious to know the relationship with Austria. For anyone with similar issues, I deleted the Fi esim and reinstalled and now I think all is working as a dual standby phone should.
