TextSecure:Protect your private information
TextSecure is a messaging app that allows you to have private conversations via both text messaging and voice calls. It is free, supports group calls and texts, and allows you to share media. Best of all, it’s open source, so you can rest assured that all encryption is done in a proper manner and the ever-longer hands of the government won’t reach your private life. The server also never has access to any of your communication and never stores any data.