This is the most comprehensive read you will find anywhere on Local Search Rank Factors. There is nothing to add or detract from it.
If you are the type that likes to Do It Yourself, this is the source. If you just need to be convinced of something I’ve said or recommended, you don’t have to take my word for it. Just read.
What I have said many times, and the main purpose of linking, is to bookmark the issue of Tracking Numbers. See Negative Ranking Factors section. Tracking phone numbers rank #3 and #4 out of 30. That is, I think, accurately stated.