by Claudine Zap The iPhone 4 . A technical marvel. Unless you want to make calls. At least, that's been a gripe of some new users of the gadget â€" prompting complaints all over the Web and even a class action lawsuit . That's right â€" the group of lawyers  that sued Facebook over misleading ads on Farmville and Marifa Wars has set its sights on the Apple phone dropped-call glitch. As soon as the iPhone 4 became available last week,