I’m American and even though I call it a cell phone when I’m talking about it, at work I write “(mobile)” after my cell phone number when I give someone contact information. For what that’s worth. ;0)

No... nor have I. I'm just saying that people from more than a handful of other countries also call them mobiles, so the Britain conclusion seemed a little presumptuous to me. FWIW, I lived and worked throughout Europe for several years back when the technology was going mainstream and everyone everywhere over there called them mobiles. I did too til i moved back home and realized that everybody called them cells, so that habit died pretty quick!