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Yes, the Fairphone (in fact, every Fairphone from FP1 to FP3 and FP3+) has a primary microphone (a tiny hole at the slim bottom side of the device) and a secondary microphone (at the opposite end of the device). If you dial * # * # 6 6 # * # * Fairphone OS should give you a range of hardware tests that allow you to test not just these two microphones individually, but a lot of other hardware components.