I was just using an mobile app to scan and create a pdf doc earlier and thought this could be a make-shift solution in remote locations and/or if you haven’t manage to find a proper scanning device.
For the application, I use Evernote. I understand there are other applications, including CamScanner or Office Lense, you can use too.
In terms of the hardware, my phone’s camera resolution was good enough. But it was bit tricky to figure out the lighting and my hands were bit shaky. For this i think using cardboard to create a structure may help as can be seen here: http://lifehacker.com/5324574/create-an-iphone-document-scanner-from-cardboard