I would have to say it would be a PDA, because they generally arent much bigger than a cell phone. at least mine is pretty small anyway. there are certain brands that make larger ones almost the size of a tablet, but in general terms, PDAs are usually pretty small. hope this helps.
ICloud because it links your old device to the new one
A good employee, everything u named is a good example of a good employee
Applying a bug fix: software update (patch)
Addressing a security flaw: software update (patch)
Improve ease of use: Software Update (new version)
Adding features: Software Update (new version)
This is what I believe the answer is! Hope this helped!