The problem is that, with one exception, I don't know anybody who calls me just to talk. So, when it rings, that means that something has gone wrong, and it's urgent, and I'm going to have to scrape up whatever shreds of Cope I have left. Especially after this last year, it's not much wonder that I want to run away and hide when I hear it go off. That I'll be lying in bed half asleep and hear it ring... except that if I get up and check, it didn't actually ring.
The sound for incoming text messages: not a problem! No shot of adrenaline, no tightening of the gut. Those are just friends, or Twitter notifications. Harmless.
It's just the damn ringtone.