I had similar issues too. Awful customer service, more than a month shipping delay for the Pixel 3, "Google Fi VPN" does not work in China, only the mobile data, is better to buy a SIM over there, Wifi calling didn't work either. Now here in the US, the signal is pretty bad too, sometimes while talking to someone the call just goes silent and the other person can't hear you. My pixel 3 makes a weird noise ( like an insect trapped inside your phone) from time to time. and more... I switched to Verizon a month ago.