I found this to be a very obnoxious comic. It's entirely saying "hey people, look at this way in which I am better than you." It's especially dumb because if you think about it, what is a ringing sound for a cell phone? There are rings that sound like old landline phones, but those are uncommon and weird. Is he really saying he never uses standard ringtones? Why is that something to be proud of?
Anyway, I just find it very self righteous and not something I imagine many readers will identify with, and if you don't recognize some aspect of truth in something then it will never be funny.