According to documents leaked by Edward Snowden, NSA's and GCHQ's Mobile Handset Exploitation Team infiltrated Gemalto's infrastructure to steal SIM authentication keys, allowing them to secretly monitor mobile communications. GCHQ codenamed the program "DAPINO GAMMA". The secret GCHQ document leaked by Snowden also claimed the ability to manipulate billing records to conceal their own activity and having access to authentication servers to decrypt voice calls and text messages. Snowden stated that "When the NSA and GCHQ compromised the security of potentially billions of phones (3g/4g encryption relies on the shared secret resident on the sim), they not only screwed the manufacturer, they screwed all of us, because the only way to address the security compromise is to recall and replace every SIM sold by Gemalto."