I had a Samsung Micro SD card in my Lumia 630 (16 GB, Class 6) working flawlessly with my Lumia 630. However, I decided to upgrade the storage to 32 GB, so I bought SanDisk 32 GB Ultra Plus (Class 10). It is also working flawlessly, but it seems a bit.. slower. I was wondering, is that OK for an SD Card and am I just imagining the slower speed? On the package of the SanDisk card, it says it is designed for Android phones, but it also works on my Lumia 630. Thank you.