I just found it very distracting when the little boys in the pew in front of us were getting loud and rambunctious (mom had to keep telling them to be quiet and stay in the pew). But then, what kind of example do you set about being reverant when you're browsing Facebook on your phone?
I am not trying to come off as holier-than-thou, though I know it sounds that way. I really do understand that it can be difficult to keep kids calm for an hour or more. Heaven knows that more than once I have had to take my kid(s) out because they couldn't behave. I just feel that some parents should put more effort into teaching their children appropriate behavior in church.