I am inclined to agree with snysop, I generally have to deal with this kind of stuff in work. Before I forward any warnings to users I check on the web to make sure I know what I'm up against. A good place to look if you’re not sure is:
I agree with laffen and snysop measures on reception of such a warnings.
Don't care about phone viruses. Oh my God!! Anyone can belive it?
When J2ME and so on becomes more popular all is possible. But not now. The only thing that can f**k you is a "teardrop" attack. What is this? Well, How about 200 SMS at same time againts your phone?