If an officer testifying in my jurisdiction's traffic court can't say when they were trained in radar, when their radar was calibrated, and what model of radar they use, the citation is automatically dismissed. I have certifications for all three of those that I present in evidence immediately after giving general testimony. The smart phone is completely irrelevant to this case.
Essentially, lacking the predicate to introduce the radar into evidence, the officer was saying "he was speeding because I said so, and therefore I wrote him a ticket." Of course the judge threw it out.