The Windows Phone 8 supports 3 different resolutions which includes
- WVGA with 480 X 800 pixels and scale factor of 1.0.
- WXGA with 768 X 1280 pixels and scale factor of 1.6.
- HD720P with 720 X 1280 pixels and scale factor of 1.5.
The WVGA with 480 X 800 was already supported in Windows Phone 7.8 and earlier version and the other 2 resolutions are new in Windows Phone 8.