Has to be 3g 2100mhz and you must be in 3g coverage to use mobile tv. Also if you purchase a import handset there is a good chance that services like mobile tv could not work. Please dont moan if services you expect to work dont.
On a side note, the w950 is a little tough to get a hold of these days. As far as I'm aware, Vodafone retailers around wellington have stopped stocking them all together. Dick Smiths still have them going for a solid $399 though.