So it is like face time and other apps. right.
How is it charged for service?
Good or bad? Thanks guys and gals.

I installed app to see grandson more often. It has worked very well. I am no where close to getting charged a dime extra in data, though it does count. If you have poor cell service, you may find WIFI at home the better connection.

It's a Google app, right? And for what is Google known?

Use Signal Private Messenger. Text, talk, video: All end-to-end encrypted. So secure they recently told the Australian government "Sorry, no way for us to back-door it for you." No charges (other than normal carrier data limits/charges). No adverts. No tracking.