S.A.R.S.S - SMS for Windows Mobile® Phones 8
Send and Receive Highly Encrypted SMS Messages
Send and receive highly encrypted SMS messages with a 64 bit custom encryption algorithm.
Nobody else can read your SMS messages without SARSS and a valid password. Very useful in case you have forgotten your phone in your friend's home or in case you have lost it.
Regular SMS messages are transmitted and received in unencrypted form. SARSS helps you keep your messages secured from third-parties, monitoring services and other interception technologies.
Download your free copy of SARSS from the Windows Phone Marketplace!