If you printing on 2d sublimation phone cases then you probably noted how hard is to layout your image to get best print? There is camera lens on the way, flash and other bits that back of your phone may have.
Simple solution is to use templates. Here you can download few sublimation mobile phone case templates in both file formats. PSD and PNG.
I hope you will enjoy using them. In nearest future i will update this library with other phones too.