I would bring it but be cautious about flashing it in public places casually like we do often times without thinking twice in the USA for instance. Regardless, with phone plan prices here, I doubt you will be strolling down Palermo gabbing away on it as you might do in the States. IPhones here are a hot commodity as they are insanely expensive to buy here so yes, I am guessing that because of this they are a hot prime target for thefts, but then again I have seen Argentine business men typing away on Blackberrys on busy Avenida Santa Fe and other crowded streets, people taking photos at boliches with their Iphones, and nothing has happened. Like anything, i guess it just depends on where you are and when, but obviously using big city common sense will probably avoid getting into situations in the first place.