Product Compatibility

[cheeksld1]

I bought a SD card for my Samsung galaxy note 2 a couple of months ago it works fine then. since then I upgraded to a note 3 and 4.
the CD card is not showing up in the note 3 or 4. my phone says blank or unsupported files !
now what ?
I can't afford to keep on buying SD cards

[Cacho]

Return it.

Link: http://www.sandisk.com/about-sandisk/contact-us/

[Tapeworm]

Or, considering that this same card worked in your old device, but not in your newer ones it would be logical to assume there's something amiss in the newer ones. You should probably explore Samsung's Support webpage and/or forums (if there is one) for an answer.