I literally never get calls at all, and I prefer to email/text message with people over calling... So... Uhm, unless it's someone who I suspect wants something very urgently, I'll let it ring, and hopefully they will send a text message instead. If they left a message after the tone, of course I'll have to call them back or something, but a lot of the time I've avoided talking to someone on teh phone just by letting it ring, or not seeing the call. They later emailed me, or something like that, so I didn't have to tlak on the phone...
I don't know why, I just feel like it's very unpersonal to talk on the phone. Writing is of course, even less personal, but it feels so unpersonal that it doesn't really matter, talking on the phone however, makes for these "awkward silences", where you feel like you HAVE to talk about something, and it generally just promotes dead-talk to have something to talk about. While writing, you don't really feel the need to write useless shit just because there is a silence, because there isn't any "silence" in a text...
That being said, my phone is not even near my computer, so if someone called me while playing, I would probably not notice it, as the sound is turned off... Who'd want to call me anyway? If I did hear/notice my phone ringing however, I would probably pause the game/be afk to answer it, as it would probably be urgent if someone called me. Yeah, I might ruin the game for 9 other people in a dota game, or something like that... But what if my grandmother died or something? What's more important, my grandmother or a dota game? ...
Of course, it could be something totally pointless, and I could have just wasted my time by picking up the call... But you never know!