Your repacking and selling of the data is hugely interesting. This would give fantastic insight in to consumer behavior, not just for the obvious marketing potential but also for companies like UBS to get market info on retailers like walmart (http://classic.cnbc.com/id/38722872/).
I'm surprised this isn't being done already by cell phone providers.
As a startup idea, it's probably worth mocking up.
There have been several meta apps like this in the past. Spockeo comes to mind (http://www.spokeo.com/) These guys are focused on data retrieval from mostly online sources. What gets interesting is mashing it all up and putting it in a narrative, tracking format. Going for a job interview tomorrow? Take some time today and read a narrative of how this guy spent his days for the last month and gain a bit of an advantage. Welcome to the 21st century.
I'm surprised this isn't being done already by cell phone providers.