FreedomPop introduces the secure "Snowden Phone"9
The phone itself is not spectacular. FreedomPop took a 2 and a half year old Samsung Galaxy S II and made changes to the software which now encrypts voice and text and uses a virtual private network to keep web browsing anonymous. Those purchasing the device, priced at $189 with no contract, are being allowed to change phone numbers whenever they want to.
Even with a new phone number every now and then, the carrier still tracks your SIM card's ICCID, so you don't totally disappear from the system. FreedomPop will even accept payment in Bitcoins if you want to keep some level of anonymity. But keep in mind that if the person at the other end of your call or text isn't using the same phone or apps, your illusion of security is just that, an illusion.
source: FreedomPop, Geek via PCMag