Did you find this thread:
Or do you mean the Fairphone 2:
USB Port Micro-B 2.0 with OTG support
(from the specs page; OTG = On-the-Go)
Personally, I don’t like chargers with fixed cables. (And I generally charge when connected to a computer that I’m using at that moment). They need the fixed cable because of the USB OTG feature. Otherwise it is a nice idea, though I wonder how the impact of producing a new charger compares to the impact of continuing to use the charger you already have…