Pulled this out in my Samsung Galaxy S9+. It took me a second to realize that there is a bevel on one edge of the phone compartment slot where the microSD card sits that needs to be angled and then rotated down for proper seating. It's easier to do than I can describe, but just pay attention to the shape and bevels of the SIM and microSD tray slots and you'll be fine. I didn't run a speed test, but I first went through all my music and media files (images/videos) - over 25 gigabytes - and it was lightning fast. Very happy with this purchase.
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