My galaxy s4 says my sd card cant be read but there's nothing wrong with the sd card I put it in another phone and it works fi

[Bamagal1970]

I have a Samsung Galaxy S4 it says periodically that my sd card cant be read. Not sure why. I took sd card out after safely removing it and placed it in another phone and it was fine. It's worked before in my Galaxy S4 so I don't know what causes this now. Please Help if anyone knows why this could happen.

 

[Saga Lout]

Does another card work in that phone? Test that and if it doesn't, a tiny speck of dust could interrupt those small connectors but a vacuum cleaner, carefully applied to the slot, could help you.