CarrierIQ has responded in a statement that it has “never provided any data to the FBI. If approached by a law enforcement agency, we would refer them to the network operators because the diagnostic data collected belongs to them and not Carrier IQ.”
They have also released a PDF apparently giving you more details about what they do.

"By explicitly refusing to answer questions while implying that Carrier IQ can in fact be used as Big Brother spyware, the government just poured gas on the privacy fire Carrier IQ has been desperately trying to put out."