How do I reset my messaging app?

Search for Settings in the App Drawer. Once there, select Apps and Notifications > See All Apps and choose the app you want to reset. Once selected, go to Advanced then tap Open By Default. Tap Clear Defaults.

Why is my messaging app not working?

The conflicts between the old caches and the new Android version will cause errors including message app error. So you can go to clear the message app’s cache and data to fix the “message app not working” issue. The following are the steps to clear caches and data: … Find the SMS app and then clear cache and data.