I appreciate the value of this, but the incentives are too biased to function properly. I think a good remedy (which would also tackle a number of other conflicts of interests and biased incentives) would be for anti-trust prohibitions on mobile network operators from selling cell phones at all.

Let the network operators continue to certify phones, like hardware manufacturers do with hard drives, memory, etc., dimmer manufacturers do with LEDs, etc.

Make the certification tests, steps and costs transparent to both device manufacturers and the public.