It's not just a providers. I've got a couple of el-cheapo $80 Androids just a month ago to use while traveling. They're running 4.4, Android 5 is not at all being offered for them, and probably never will. I guess I can throw them in the trash if I care about owning them myself.

Being el-cheapos, they aren't even supported by cyanogenmod. Anyone has an idea for how to use them (somewhat) securely?