The more contact numbers one has, the harder one is to reach

Click to enlarge or follow link below to original cartoon.

In a post earlier this month I mentioned in passing that the more contact numbers someone has, the harder they are to get hold of (I'll have to remember to include this in my next installment of Curmudgeon's Laws). Anyway, it appears that one of my favorite webcomics, xkcd, has noticed the same thing.

Naturally, I only understand half the references here, but I'm pretty sure I'm interpreting this correctly....