The Oculus mobile app acts as a companion to your Oculus headset. With the mobile app you can:
Stay notified of sales and upcoming releases.
Buy, download, and remote-install VR apps.
Browse and manage your VR apps.
Customize your device settings.
Cast your VR experience to your phone or any Chromecast enabled device.
Set up your Quest or Go headset.
Your phone must be connected to Wi-Fi and have Bluetooth turned on to use the mobile app to set up your Oculus Quest.
If you aren't prompted to download the mobile app initially, but run into any issues during the set up process while you're in-VR, you can use the app to complete your setup.
If you install the Oculus app on an unsupported device, you may experience issues setting up your Oculus Quest.