Threema is a mobile messaging app that puts security first. With true end-to-end encryption, you can rest assured that only you and the intended recipient can read your messages.
Unlike other popular messaging apps (including those claiming to use encryption), even we as the server operator have absolutely no way to read your messages.
Features:
• End-to-end encryption of text messages, images, videos and GPS locations
• Contact synchronization (optional): find other Threema users automatically
• Send images and videos
• Share your location on a map
• Verify your contacts' public keys by scanning a QR code from their mobile phone, all within the app
Threema is Made in Switzerland, and all servers are hosted there as well for maximum privacy
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Link?
Strange thought I posted it – see how secure it is..
Apple: https://itunes.apple.com/us/app/threema/id578665578?ls=1&mt=8
Android: https://play.google.com/store/apps/details?id=ch.threema.app
In Spain the is one very popular called : SpotBros
Wrote a blog entry about it here : http://kiledjian.com/main/2013/12/7/the-most-secure-smartphone-messaging-app