That's only sequential write speed. Of course the camera features on a phone will have no problem using an SD card, but other stuff dealing with more random wri

That's only sequential write speed. Of course the camera features on a phone will have no problem using an SD card, but other stuff dealing with more random writes to things like SQLite stores (common for phone apps) or directory trees might. Like I said, I've only used an SD card on my Mac, and it was a bad experience, so I'm guessing a bit about phone usage. 90MB/s is slower than most HDDs, btw.