This thing is small. I mean REALLY small. Like size of your thumb small. It takes standard modern sim cards AND will synch your contacts accross from your regular phone. 3 days standby time and clear and loud voicecalls and not a lot else makes this an awesome little device if you're looking to get away from it all but not entirely.
It does not come with a sim, but is unlocked so you can put any sim at all into it. Pop your own in or consider a cheap monthly all you can eat sim like the Gomo