I also posted the same problem. Mine just stopped working on the 2nd Jan. I factory reset after all trouble shooting didn't fix the issue. I ended up putting my sons sim in. EE the same as my network. Worked no problem. So after contacted EE there sending me out a new sim card. I'm hoping it's going to work again. Samsung messages just says registration failed, Google just won't verify my number. Also said my device wasn't compatable. Note 20 ultra, its worked fine for months. I'm just hoping it's nothing to do with my number as the new sim will be the same number.
