Oh god, please no!
Is it really worth making your flight-neighbours' journeys hell just so you can have a natter? Isn't it a tad selfish? You'd be miffed if your neighbour watched movies or listened to his music without headphones on, so what's the difference?
Is it really so important for you to make that call that now rather than a)wait until you land, or b) email/text-chat?
I will be first in line demanding airlines segregate the chattering-classes to, well, a class of their own...