Here's my little thought last night.
There are a few types of guys which you an identify from the phone when they're busy.
"Hi, Are you busy? Am I bothering anything?"
Eg. He's playing a computer game.

Type A: Oh you're not bothering me but I'm sorry, I'm playing a game here, can I call you back later? - Sensitive, he isn't really bothered he just wants to continue the game, a lot of credit on his phone.

Type B: Oh, I'm playing a game, call me later. -Straightforward, common sense, irritating because you won't know when he would finish his game anyway.

Type C: Actually, I'm playing a game. - Indirect, not answering the question, he assumes that we should know how he actually feels - obviously unexperienced.

Type D: I'm busy right now ...(Diciples III music fades in the background) - He probably thinks girls can't understand the need to play.

Type E: No, not at all, I'm not doing anything, really, go on .. (A voice from the background said, "Hey why do you suddenly shut down your PC?") - Either the girl's extra special, or he's the submissive pleasing-everyone kind

Type F: I'm playing here, but do go on. -He works in the computer department or IT thing. These types of guy are used to multitasking, they force their brain on 256 MB RAM.