(From this reddit thread for the Galaxy s10.)
- Download this zip: GCam.zip.
- Open My Files, find the Gcam.zip (probably under Internal Storage/Downloads/) then tap the GCam.zip, click Extract, then press Back, and you should see a GCam folder. Long press that, select Move, go back to Internal Storage, click Move Here.
- Open Google Camera, double tap the black space around the shutter button.
- March patch: Select S10csMar2.xml and Restore. Now when you cycle the camera switch icon you'll get the wide angle sensor eventually.
Please note that the original post or files can be modified or deleted after this page was created.