Mobile phones with Sat nav built in

I am looking for a mobile phone that i can use to ring people, text people and to be able to use as a sat nav to help me find places. Does any one have any recommendations or suggestions? Or any body any ones they would say not to get.

Thanks!

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From the reviews that I've seen, none of the GPS-equipped mobile phones seem to do the whole navigation thing very well; most GPS-equipped phones don't actually have sat-nav software bundled with them, so you'd end up buying something like the TomTom software separately anyway - by the time you've done that, you'd be better off buying a cheap sat-nav instead.