Head of Google's web spam team, Matt Cutts, went on record on those sites that rank well for all those random phone numbers. You know, the ones that simply list thousands of phone numbers on a single page? He said it is spam, keyword stuffing and is against Google's guidelines.
Matt Cutts said:
I wanted to clarify a quick point: when people search for a phone number and land on a page like the one below, it's not really useful and a bad user experience. Also, we do consider it to be keyword stuffing to put so many phone numbers on a page.
There are a few websites that provide value-add for some phone numbers, e.g. sites that let people discuss a specific phone number that keeps calling them over and over. But if a site stuffs a large number of numbers on its pages without substantial value-add, that can violate our guidelines, not to mention annoy users.
Of course, it is hard to argue with that. I personally hate sites that show up in Google's search results with this information. But it is happening right this second.
Here is a picture of one of many examples:
Is this a new penalty? Will Google be going after sites like this now? Matt makes it sound like it is nothing new. He wrote later on:
These pages have always been considered violations of our guidelines as keyword stuffing--I just wanted to be especially clear so that we could point to explicit guidance we'd given.
But they run rampant in Google's search results - so maybe something is going to happen soon with it?
Forum discussion at Google+.