The way textPlus works very similar to apps such as Viber or Skype. Users will have to sign up for the service, which gives them access to all of the app's features.
textPlus' basic, free functions include the ability to send messages for free to other users, and to make free voice calls to other users.
In order to make phone calls to other phone numbers (that don't have textPlus), you'll need a subscription to the service, although during sign-up, textPlus offers free credit to new users.
textPlus is a great messaging tool that includes the possibility of making phone calls. In addition, its simple interface integrates perfectly with Android terminals.