I'm on AT&T. This month, my calls stopped working. If anyone tries to call me, it acts like the line is busy. If I try to call someone, it immediately hangs up. Two on call with support with AT&T, a text chat with an ASUS support staff, nothing useful. My friend 2 towns over is having the same issue with their Zen 8. I have the 16/256 model from Playfone on Newegg VoLTE and everything is enable, I have Data and Text. IDK why I'm not seeing more people with this issue online. It's clearly not just me. They are trying to get me to trade in, but I don't want to. This phone is perfect for me, and I want to do everything I can to keep it.