Is there any iPhone apps for private calls and private sms?

I'm looking for a app that will be like a decoy for my regular text messages, I know android has an app called MyCalculator i need something like that.

Probably you'll find such Apps here:
http://www.apps-catalog.com/products/social-apps
http://nanostuffs.com/AppsCatalog/ws/freeapps.php?categoryid=4228534c277c