All of my Spanish II and III students used cell phones on their final exams this year. And I was so proud of them!
They had been using their cell phones (specifically, QR code scanning apps like this one) all semester to access listening and reading resources. I wrote an earlier post about the benefits of doing this. The final exam, of course, had a hefty interpretive proficiency section as well as speaking and writing prompt, so the students were really just continuing to do what they had been doing for months in class.