To the best of my knowledge, the Android and iOS mobile apps are moribund. However, an inbox notification email I received this morning (I rarely get them, as I'm online often enough to usually see these things before the email is sent) ends with
Want instant inbox notifications on your phone? Download the Stack Exchange mobile app for iOS or Android.
This is followed by large icons for the Apple App Store and for Google Play.
Is this just old text that was never edited when the apps were mothballed?