Need a private conversation? The future is end to end encryption, and the latest is Redphone:

Android link  FREE!!!

https://play.google.com/store/apps/details?id=org.thoughtcrime.redphone&hl=en

Iphone/IOS  $1.99

https://itunes.apple.com/au/app/red-phone/id356116576?mt=8

Redphone allows you to use your own phone number and is very easy to install and use.

More privacy apps including secure text and chat available at:

https://whispersystems.org/