I will change display graphic on this item:
http://graphicriver.net/item/rastko-phone-mockup/6657519?WT.ac=portfolio&WT.z_author=Tomic

All you need is to have that item and finished design (16:9 ratio is best, because display proportions)

5000 x 3500 px is finished resolutions in 10 images. Finished products coming in format what you need.