If you think about, calling your mobile device a "cellular phone" is very strange.
Until the 1970s, the adjective "cellular" had nothing to do with electronics or human communication, the Oxford English Dictionary tells us. Cellular was mostly (and reasonably) applied to biological phenomenon, things to do with living cells. A 1716 writer could say, "Cutting is dangerous for the Tendons; and if that could be safely attempted, yet the Bones being cellular at the Joint, and porous, it would avail little," for example, or much later, an author in the 1968 New England Journal of Medicine could write, "Once cellular DNA is damaged, the 'message' is irretrievably lost in the medium."
There were other ways you could use the term. One could use cellular to describe some material that had a lot of cavities in it. So, Darwin could say, "I‥had noticed the presence of a few small pebbles of a very cellular basalt." Or you could describe a jail with the word, as a 1931 legal scholar did: "For prisoners on trial, the cellular system should be applied absolutely."
Looking at a portable communication device, it's not immediately apparent why it would come to be called a cellular phone. It's not made of biological cells, nor does it seem to be of, related to, or characterized by any other kind (prison, monastic) of cell.