It's in Workspace. I have tried this in many different projects including starting from scratch and it keeps happening. Below is a screen shot. This is the segment info after I tried to drag "Mobile Phone" from the left rail to the Segment area at the top of the Workspace. I guess another important ...

I have been having trouble getting Mobile Device Type values to load all day long and when they do, it looks like Mobile Phone is actually tablet. Is this a known issue?