Hello. I use "Messages" instead of the Messages+ Verizon app, as I am not a big fan. I just got my Galaxy S6 edge a couple of months ago, and noticed it was sending duplicates of my text messages to people. I do not receive multiple messages, but I do send multiples. I checked the settings and I can't figure out how to stop this. I believe it has to have something to do with service, but I noticed it's even doing it when I have great service.
If anyone has a solution, please let me know.