Was curious, original quote:
The finest trick of the devil is to persuade you that he does not exist.
From Le Spleen de Paris (1862), by Charles Baudelaire. In the movie "The Usual Suspects", this became
The greatest trick the Devil ever pulled was convincing the world he didn't exist.
But AOSP is open source? So that term wouldn't improve on the problem.
I think GNU phones or GNU-like phones is a nice way to put it.