As we've recently mentioned, we are no longer actively supporting our Stack Overflow and Stack Exchange apps on iOS and Android, and they have both been delisted from the App Store and Google Play. While we are maintaining key APIs that allow the apps to keep running for those who have already installed them, we are deprecating and turning off app-specific API features as the need arises.
One such feature is the mobile feed for the Stack Exchange app. It will go away Wednesday, June 30, 2021. The Stack Exchange app's mobile feed serves a similar function as the web-based inbox, allowing users to discover new content and see changes in their reputation. (The Stack Overflow app never had a mobile feed.)
We decided to turn off the mobile feed because its performance requirements (especially on the database) are too heavy for us to be able to maintain it any longer.
Starting June 30 (late afternoon in Eastern time), the mobile feed will no longer actively pull in new items. Instead, it will display a single item: a message that the mobile feed has been turned off, with a link to this Meta post.
You will continue to receive notifications through the app such as inbox notifications and chat pings.