I'm pretty good with answering IM's or PM's... unless I'm busy, note it with the intention of responding to it as soon as possible, and then forget about it... I'm bad at that, heh. For a response... If I can think of a response, I'll respond, but not if my response would be something like, 'Heh' or or something.
Oh, gah, I'm awful in real life though. @_@ I'm fine around people I know and am comfortable with, but if there's even one person I don't know or am not comfortable with, I get this sort of deer-in-the-headlights feel (dunno if it passes on to look, but yeah

) and can't think of any responses. To anything. And then I get frustrated with myself because I -want- to talk, to get to know the people better, but I just can't seem to. >_<
As for the phone... I rarely use it at all, unless it's calling my parents or something, or when family calls. None of my friends have my number, I think - at least none of the ones I see at school, except for maybe one of them, heh.