On the one hand, when you download wallpapers, make sure you know your cell phone can receive it or not. The bigger the size of the wallpaper, the more memory space they require. Sometimes big wallpapers cannot be downloaded by your cell phone, for your cell phone might not have enough memory space wallpaper. However, the wallpaper's size determines whether it would appear good or not on your screen. The bigger the wallpapers are, the more vivid they are. So what you should do is to download proper sized wallpaper according to the memory space of your cell phone.