Are you safe in your voice call ?

As smart phone phones are becoming more necessary device in our life, it likes a pocket-sized computers, all our network communication go through it. 
From current NSA spying, Edward Snowden news and Police tracing phone call, we should aware the importance on our network privacy.  
There are various anti-syp device (software and hardware) in the market.
The hardware device is more reliable and secure then software. 
For the hardware device, you can find blackphone, encrypted phone and others in the market.
There is also another choice, user do not need to buy a new phone, just insert the encrypted micro SD card. This card create encrypted code for each call, it just like a encrypted key generator. 

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