Same here. No problem with desktop, laptop, or iPhones. Also on AT&T...works in and out of home.Tested both at home and out on the AT&T mobile network and all is working fine for me on a laptop and iphone.
I am working just fine with Chrome and Firefox, but I was having issues with Safari since I went to Sierra and Safari 10.0. Even that is working now.I have not been able to use on my desktop computer all year. Either Chrome or Firefox. When I called and talked to someone they did not have a clue. I like to keep up with some games while at the computer.