Just a heads up to the people having trouble. This is my experience with the US best buy pre order. The first sim card I tried, an older model that I've been carrying forward for about 5 years, worked for data, calling and sending texts but not receiving texts. I got a new nano sim, says 4G LTE on it, worked with a guy through phone support to get the card activated on a Google model Pixel 2. I then moved the card to the Sony, data and texting worked but I got the server error on phone calls. I had him disable and re-enable advanced calling for my line (voLTE) then I restarted the phone and now everything is working on all LTE bands for calling, texting and data. So far I've had 24 hours of success including taking an update and pulling the sim to insert an SD card. We'll see if it holds up over time, I know the HTC u11 had periods of success followed by issues again on Verizon. Point is of all this is that I've experienced all the listed issues and a competent tech IS able to overcome them by following the steps I just listed. Good luck everybody, this phone is fantastic. Been off the charger for 18 hours with light usage (1.5 hours sot with much of that photos) walking around outside on LTE all day and still have 73% battery.