For my HTC One M7, ATT is releasing Lollipop in a two part update. First to 4.4.2, then to 5.0. The 4.4.2 crashed my WiFi, therefore no more updates, as they only come through WiFi. Several calls between ATT and HTC. ATT finally agreed to have one of their service centers look at it. They hardwired it to their computer and updated it to 5.0. Still no Wifi, and whenever the phone goes into standby mode, it reboots itself - which can be an endless loop of rebooting until the battery dies. It will also reboot in the middle of operation. ATT says sorry, but you can spend more money and upgrade. HTC agreed to look at it, and they sent me a prepaid shipping label. I will ship it off this week and see what happens. I have really liked the phone, and from the little I was able to do with it after the update, I noticed it was a lot faster and more responsive, but it is virtually unusable at this point. My son got the M8 last year and is very happy with it. When I told him, we might be moving over to Verizon, he asked if he could keep his phone.