Texts and messages.

That's a good question. I've had lots of trouble getting my SW PM replies to actually be sent. Even while I'm in a PM conversation, I'll send the reply but it'll just sit there with a little arrow at lower-left. I click it to be sure, but my correspondent sometimes doesn't receive it and assumes I've disappeared. I've regrettably stopped using the PM function because it's so frustrating. So--to answer the question--I have no idea how many messages I've missed, for the above reason.

Wait. Am I supposed to know that?
I always have people who wants my attention and they know they most likely won't get it the first second they try. I respond in a few days or so.

I never pick up my phone

Only the ones I want to miss