Check Apple’s System Status Page It’s possible the App Store isn’t working on your iPhone because of an issue with Apple’s servers. Check out Apple’s System Status page and make sure the dots are green, especially the first one next to App Store.Check Apple’s System Status for App Store. Whenever Apple’s servers face an outage, a number of features and services (i.e iCloud backup, iCloud Drive, App Store, Siri, etc.) are affected. So, if App Store is still not working on your device, it would be apt to check the system status of the App Store.
Concerning your iPhone, try disconnecting from the Wi-Fi and reconnecting. Conversely, you can also try resetting your router. I would also recommend enabling and disabling Airplane Mode and see if