It is usually offet by the phone cover. It is actually quite clever: SINCE the cover needs to have a hole anyway for the camera, use that hole to sneak a bigger

It is usually offet by the phone cover. It is actually quite clever: SINCE the cover needs to have a hole anyway for the camera, use that hole to sneak a bigger lens. All the while ensuring the hole is facing the camera, since without protrusion the hole may not be exactly in front.