Messages Not Delivered on iPhone
I switched from Mint Mobile to Verizon in June. Verizon provides reception in more areas and faster speeds than Mint which is essential when road-tripping. After activating my Verizon service, I was no longer able to send MMS messages.
My blue (iMessage) messages worked fine, but my green (MMS) messages said Not Delivered. More specifically, I could not:
- send a picture or gif to any friends who did not have an iPhone
- I could not participate in any group message thread where at least one member did not have an iPhone
I tried:
- rebooting the phone
- removing and reinserting the SIM card
- Settings > General > Reset > Reset Network Settings
- backing up and restoring the phone
Finally, I managed to get it working by
- Settings > General > Reset > Reset All Settings
This will remove all custom settings and permissions on your phone. You will need to re-grant permission for Location services and push notifications in all your apps. You background, dark/light mode and other customizations will also be reset. It will be a pain to get your phone into its previous state but this was the only way I could MMS to work again.
What I think happened is that when I joined Mint, I had an old iPhone and I had to manually set some Cellular Data/MMS configuration. Then when I updated to a newer phone/iOS version this configuration information disappeared from the phone Settings and there was no way to clear/reset it without resetting everything.
Hope this solves at least one person’s frustrations.