How do you watch full screen video on samsung e250?

To watch full-screen video on a Samsung E250, you would typically open the video in the media player or video app on the device. Once the video is playing, you can usually expand it to full screen by tapping on the full-screen icon, which is often represented by a square or rectangle symbol in the video player interface. Alternatively, you may be able to pinch outwards on the screen with two fingers to zoom in and fill the screen with the video content.