I call about 2 hours a week and still manage to use my phone more than 20 hours a week. Is calling still the primary function of my "phone"?
We just call it phone because that's what we attached a computer to, but it's more like a pocket computer with LTE modem for most people. I'd call it Pocket PC if I could!
Microsoft's trademark on Pocket PC is most likely dead, as it hasn't been seen in commerce in a long time, so you can probably call whatever you like a Pocket PC
In many countries they're just called "mobiles" or something to that effect in the local language. Originally short for "mobile phone" but it shortens down nicely generic.