In order to activate Calling plus on your S8, access your phone settings, from there you should see a Calling Plus option. Tap on it and activate it from there. Hope you find this information useful.
If that's so, please try going through Settings > System Updates > Update Profile, and let us know the results.
DianeLev, it can be either LTE/CDMA or Automatic. Let's make sure that Calling Plus is on: Go to Settings > Calling Plus is On (green).
DianeLev, I'd like to continue to assist you in a private thread, feel free to reply to my Private Message at your earliest convenience.
Please help me i am having the same problem it was working than it isnt working i went to the sprint store to get my screen fix and once i received it bck i wasn't getting regular networt but i was able to connect to wifi calking just fine thats the only way i was getting calls and texts than i went bck to the store about the problem and than once he did something in the phone i got to work and than it wasnt working telling me that he turned it off n i didnt tell him to do that so i am beyond pissed off I use it at work because where i work i dont get good service......PLEASE HELP I HAD MY PHONE MASTERED RESET AND EVERYTHING