if your thinking of trying convergence using ubuntu touch and ubuntu unity 8 you will need two things
for the computer or laptop wily werewolf, this is well in testing!
this is convergence,
and ubuntu touch on you phone or tablet, if its supported! nexus 4/5 or seven and others are suported
dont forget this is early days, the phone / tablet stuff is pretty solid but the last piece of the jigsaw the desktop isnt going to be ready till at least the end of 2015 🙂