So I've just about had it with Message+ so I'm toying with other SMS/MMS clients, like Whispersystem's Signal. If a NON-Verizon user sends me a text it arrives very quickly right in Signal. If, however, a Verizon customer, say my wife, sends me a text, it NEVER ARRIVES to my phone. This is likely because Verizon thinks I'm a chat user and not an SMS user now. Verizon has claimed it's easy to dump Message+ and use a real SMS/MMS app but clearly it's not. This smacks of the problems iPhone users have when they leave iOS for another platform and iOS users are unable to message them for days or weeks while Apple cleans up their act.
Open message+ and you have to go into the menu and click delete account.until you do that Verizon assumes you are still on the system. After you delete account it will work like it used to or you can go to any other app
Unacceptable. I'm trying to test other apps and several Verizon support reps have told me that I should be able to just change the default app. What this PROVES is if the Message+ app isn't available, say due to no WiFi or 4G/3G that you will NOT be receiving messages. That's garbage. That's unacceptable. At least with Apple, if iMessage isn't on a data connection but on a 1x connection messages still get delivered. I never have problems on my iPhone 7 Plus getting SMS messages when I'm in a no-data zone and in my area there are lots.
Verizon will have to fix this. They will need a half second rule or so. If the Verizon Message+ customer isn't on data and the message cannot be delivered in 0.5 seconds then they have to try SMS over 1x.