If you are paranoid and think that the CIA and Big Brother is capturing all your SMS messages, then you should check out Kryptext for Business.
Kryptext's SMS solution enables businesses to send and receive encrypted mobile phone SMS messages quickly to and from remote employees. Get peace of mind if you are worried about industrial espionage. Nothing is free though as it retails at 6.99 pounds and only a few Series 60 handsets work with Kryptext like the Nokia 3600, Nokia 3620, Nokia 3650, Nokia 3660. So I suspect you'll need to email them for a full list of phones that work.
In a real incident, the Marks and Spencer's chairman became the victim of a third party attempting to steal his mobile phone records. So with Kryptext, the message is unreadable until a correct password is entered.
Encrypted SMS with Kryptext for Business site
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