The EFF provided evidence in two of its cases that it was not just AT&T that helped the NSA collect phone records for millions of Americans, but also Verizon Wireless and Sprint. This information was not previously given by the government, which claimed that it was a state secret.

http://www.tomshardware.com/news/eff-att-verizon-sprint-nsa,30074.html

The EFF provided evidence in two of its cases that it was not just AT&T that helped the NSA collect phone records for millions of Americans, but also Verizon Wireless and Sprint. This information was not previously given by the government, which claimed that it was a state secret.
Despite all the revelations in the media from Snowden’s documents and other sources that the U.S. government is collecting citizens’ information, the administration is still claiming that either individuals or organizations such as the EFF have “no standing” to sue because they can’t prove that they were spied upon.
Of course, this kind of argument quickly turns into circular logic, because such evidence is often secret and can’t be easily given away via FOIA requests either (the released documents are often heavily redacted to the point of being useless). Therefore, you can’t prove you were spied upon because that information is typically classified.
Still, this time the EFF managed to get some evidence that AT&T, Verizon Wireless and Sprint were involved in helping NSA with the mass collection of phone records, from filings made to the secret Foreign Intelligence Surveillance Court (FISC) that were recently made public.
The EFF also got a letter sent from the DoJ to the FISC that was released in a FOIA lawsuit started by the New York Times, where the names “AT&T,” “Verizon,” “Verizon Wireless,” and “Sprint” are mentioned in regards to phone records collection. From a previously-released document by the Office of the Director of National Intelligence, the EFF learned that the letter is indeed about the mass collection of phone records.