Why all of a sudden do I need to be in a WIFI area or use my DATA to send or receive text messages ?
Check the many threads regarding the newest updates to Verizon Messages+ ... you are not alone.
I have the same frustrating issue since the update
Which version of Messenger+ are you on? FYI, there have been 4 updates in as many days - the most current is 6.4.4 which seems to be the most stable and reliable for some (me included). It's still not there, but getting closer.