"Free Text Messaging" is an interesting 4 year period, though it looks like it's dead as a search term now. Is this because of Google Voice? Or did people give up on the idea?
http://www.google.com/trends/correlate/search?e=id:g2VSqRc0n...
http://www.google.com/trends/correlate/search?e=id:g2VSqRc0n...