If it were me, I'd back up any important photos or messages. You could probably keep the app after it's been shut down but then it's just a dead weight taking up storage space.
Hello,
Starting on October 2, 2024, Verizon will start to shut down the Verizon Message+ app.
For more details, please check out our Messaging+ FAQs page.
@SynthpopAddict Thanks for responding! That is a good idea.
~Gilbert