It IS intrusive! When the phone rings, for some reason you're expected to drop anything else you might be doing, stop talking to whoever you're already talking to - who might even have taken the trouble to actually come over and visit in person, turn off any music you might be listening to or movie you might be watching, hop to it and take the phone, to talk to whoever fancied chatting with you right now, because they're bored in a car or something.

Heh, no wonder no-one ever calls me.