Fullscreen XNA applications actually work as expected on devices with 1280×768 resolution – they fill the whole screen. This is due to the built in hardware scaler which automatically scales up image to the real resolution.
However, when running fullscreen XNA applications on devices with 1280×720 resolution, there are black bars on either side of the screen. This means it’s difficult to support WP8 devices when creating fullscreen apps with XNA. This article explains how to create such apps that will run correctly on all Windows Phone 8 devices.
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