Details: http://electrospaces.blogspot.com/2013/04/how-obamas-blackberry-got-secured.html http://electrospaces.blogspot.com/2013/04/how-obamas-blackbe... Secur

Details: http://electrospaces.blogspot.com/2013/04/how-obamas-blackberry-got-secured.html http://electrospaces.blogspot.com/2013/04/how-obamas-blackbe... SecurVoice software by Genesis Key, a short list of contacts that also have compatible communications devices (unclear if that's required or if that's only for classified communications, since a photo caption has Obama calling Romney), and possibly other hardware or firmware modifications that are not disclosed. IMEI kept secret, and the phone might only connect to a special secured base station.