I wanted to just call mine by name without having to say a long phrase, but was disappointed when the set-up program kept telling my that my phrase needed to be longer. I ended up with the phrase "Ok Megaera", but in use, all I end up having to say is "Megaera" and the phone responds.
If you are curious, Megaera is one of the Greek Furies. I wanted a name that is easy to remember, but that I would seldom say in normal conversation around my phone.