For example, you can now get the Chicago's mayor's phone records by requesting it through their IT department, who asks the phone company to parse their billing logs, which includes the phone records.
Two tabs, and still a work in progress (waiting for their dns resolution logs now for the next step): https://docs.google.com/spreadsheets/d/1hgG79eIr8MbkjYrCvcTR...
How do you do this?
If you can't find a lawyer, find someone locally who knows FOIA very well. Lots of activism and open data crowds have loads of experience with it.
BB users by and large consider government surveillance irrelevant.
And interestingly, every single BB user I know works for the government (I'm in Canada).
There soon won't be any Blackberry to buy anyway…