Sonoma's Davey
It's hard for me to evaluate this product in detail, but I can report that it works just in my Samsung Galaxy S5. I turned the phone off (probably much better to insert/remove cards with the phone turned off) and then slid the card into the slot inside the back of the phone. When I turned the phone back on, there was no obvious indication that I had made any changes at all. However, when I started to take photos, the camera reported that it would now be storing pictures on the card instead of the phone's internal flash memory. So everything seems to work well.