"Handy" simply denotes a mobile telephone. While virtually all mobile telephones have technological features that wired telephones did not, it does not capture

"Handy" simply denotes a mobile telephone. While virtually all mobile telephones have technological features that wired telephones did not, it does not capture the difference between a basic mobile phone and a modern smartphone; the former is a phone that may do computer-like things while the latter is a pocket computer that also makes phone calls. "Smartphone" may not be the best possible name, but it seems to communicate to most people "Android, iPhone or similar".