In an advanced space-faring society, is there any reason not to call the communication devices that sit in characters' pockets or around their wrists "phones?" They had the "comm-link" in the first Star Wars movie and the "communicator" in Star Trek, but those were obviously developed long before cell phones or smart phones. I can't think of a reason to give it a fancy, unique name... or imagine how the future would weed out the term even if we invented trans-light travel tomorrow. The telephone aspect of our phone is like 1% of its functionality already, but we still call it a "phone."