Firstly I find it hard to believe that these telecoms acted in 'good faith'. Their legal departments should be well versed on what the law is regarding domestic surveillance. The fact that they were issued these "Get Out of Jail Free" cards by the President is actually evidence of this. That is...
http://en.wikipedia.org/wiki/Dismissal_of_U.S._attorneys_controversy#Dismissal_of_U.S._Attorneys_under_previous_administrations
[emphasis added]
Why do people just pull figures out of thin air when information is usually just a couple of clicks away?