The Fairphone 2 is way too expensive for a bunch of people. Some hipsters might want to afford this but lots of other potential customers, for example those who spend a lot of time in volunteer, family or whatever work, are for sure not that rich. And they are not so keen on the latest technology that they would spend more than 500 EUR on a gadget for making calls, checking messages and takings pics every now and then.
This desription includes me but also a number of other people I know and whom I generally consider open for fair products.
Maybe you could offer one high tech and one lower tech fairphone.
Edit: Concerning the applications, I was a bit too short: Of course, many people want to use all common smartphone applications like web access and navigation and media, and would like to this fair, but still cannot afford 500 EUR.