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Gizmodo has taken a look at the recent news from Google and the opportunity in the USA to port your mobile number to Google Voice and presented the pros and cons.
In my view if you're using an Android phone, then the deeper integration of GV makes it less of a hurdle, but on RIM Blackberries and the Apple iPhone the apps are not as woven into the phones as much as they enable people to make use of the free service.