Ever since I got my Lumia, I've never been able to activate the hotspot, but I can do it on all of the other 4G devices that I've used. Every time I try to activate it, it asks if I want to add it to my plan, but the Share Everything plan has it included, and on top of that, I'm grandfathered into the 5GB of free tethering from when I had my Palm Pixi Plus. Any suggestions on how to get it working