don't put any trust in so-called 'secret' encryption technologies - especially not the commercially available ones - I would guesstimate that easily >90% of all the major 'secure encryption' apps for consumers, have built in NSA-ready backdoors. And the ones that don't have backdoors, use algorithms that are easily readable and decryted at speed by NSA and other intel groups.
Yes you can hide data from granny or mom, or even semi-savvy business folks - but forget about almost any of the commercial software providing a genuine secure encryption solution - regardless of what the makers may say.
In a world that's advanced beyond using non conductive cement around PC's with classified data on them, (to avoid the electromagnetic radiation from being picked up and deciphered - either through the walls, or via a standard telephone line - look up Tempest technology) - to be thinking that an arb commercial encryption package can secure anything, is to be out of touch with modern forensic intelligence-gathering techniques.
re Tempest, for documentation
http://cryptome.org/nsa-tempest.htm
And as for cellphones and sms's - again, easy as pie to track, monitor and if necessary, decipher. It's just a radio, regardless of frequency changing - GSM encryption got hacked a long time back - and that's by 'amateurs'. 'Official' surveillance techniques are always massively ahead of what the public may think is the norm, as with any R&D and military projects..