A smartphone can be compatible with apps like CamScanner or Microsoft's own scanner app, but it would be impacted negatively if, say, your smartphone camera's megapixel count is less, resulting in an overall low resolution image. This would deteriorate in quality even if you slightly zoomed in. I would recommend accessing an actual scanner even if it is in a public place or a college or something.
However, if you cannot get a scanner and HAVE to use a smartphone, at least an 8 Megapixel camera would create a decent resolution as a starting point. I'd still say access a scanner. It's your PR application and it's quite a significant point in life.