Android smartphones get their own version of Cellcrypt Mobile, an encrypted voice calling app running over wifi, GSM and CDMA networks. 

It supports Android 2.3, and interoperates with Cellcrypt running on Nokia and Blackberry devices. 

The application works on off-the-shell smartphone models as a software-only solution using cellular (2G, 3G, 4G), wifi and satellite network IP channels.

Cellcrypt says governments and corporations worldwide use its app, which has FIPS 140-2 security standards (from the US National Institutes of Standards and Technology) and the CESG Claims Test Mark (CCTM) in the UK.

Go Cellcrypt