People were asking why do you bother to encrypt content of your message. Shouldn't the mobile network (either 2G or 3G) be quite secure for transmitting my message over the air (OTA) in peer-to-peer communication?
Well, this is a good question. But, do you know most (if not all) of short message center (a.k.a. SMSC) of service provider operate in a kind of store-and-forward mechanism that means your message is kept in its database / internal store for handling. Technically speaking, for anyone with proper permission or someone with domain knowledge and equipped with proper tools they might be able to read your message without your awareness.
Therefore, this is the solely reason behind for the birth of "Secure SMS" application for Android. For those of you paranoid who ask for a higher level of privacy control and or for corporate who want to send one time password / sensitive information OTA to clients, Secure SMS is the right answer to your concern.
You can download it from Android Market at https://market.android.com/details?id=com.ngnlive.plmn.securesms
For a how-to guide of the application, you might want to read this article at http://ngnlive.blogspot.com/2011/05/englishhow-to-use-secure-sms.html too.
