Your OP won't save you. Only code, you got any?
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Shadow's encrypted messaging system was coded by their devs, and since being open sourced is being used by StealthCoin, DarkShibe, Boomcoin, Gnosis, XCash...
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StealthCoin don't have a encrypted messaging system
You must learn more about stealthtext.
Stealthtext is an app to send stealthcoins anonymously, using a cell phone that no need to be connected on the internet.
The coins are sent by sms and disguised as an encrypted text message.
If this is intercepted by the NSA, the only thing that appears is that you are sending an encrypted message. The coins don't appear.
After current roadmap is completed, this app will be developed for ios and also to non smartphones.
You will can buy a dumbphone for $10, make a payment with it and then throw it in the trash