"Asked how many terrorism cases were cracked using U.S. phone records, John “Chris” Inglis, NSA’s deputy director, answered that a dozen domestic terrorism investigations had made use of the records. But Inglis could cite only one in which the records were instrumental: a group of men from San Diego who sent $8,500 to Al Qaeda-linked militants in Somalia. One of the defendants in that case was discovered when a known terrorist phone number in Somalia was compared against the database, Inglis said."[1]

[1]http://www.latimes.com/news/politics/la-pn-secret-nsa-survei...