Comment Re:I have news! (Score 1) 328
The cell site's lat/long is public information.
The cell site used for the call is needed so that when there is a disagreement, as in "I wasn't in that city, there's no way I could have made that call", they can provide all of the information needed to resolve the problem, such as showing that you were registered in another city entirely at that time.
Additionally, it seems they've got legislated data retention rules, but they have typically been based around the existing retention policies the carriers have in order to avoid having to pay the carriers (like the US govt pays carriers for legal intercept).
http://en.wikipedia.org/wiki/Telecommunications_data_retention
In other words, cell towers aren't secret, and if you don't want to have your data retained, talk to the government, not the carriers.