On the contrary, today it's being taken very seriously. There are questions--are the effects really because of radiation or because of other factors as yet untested? In any case it's going to be very interesting to see how it plays out; when behaviors are very entrenched there's usually a concerted effort to make them "okay" rather than change the behavior. If I were still having babies I'd have a very hard time with this one, but I don't think I could ignore it, either.
Warning: Using a mobile phone while pregnant can seriously damage your baby