Fits perfectly in my Samsung Galaxy S4 Active.  No installation or recognition issues.  The phone nicely takes over as a portable media device on long flights.  This card presently contains several movies and a huge amount of music across many genres.  The phone mates perfectly with powered headphones, making the phone + card combo a powerhouse.  Room for plenty of apps, too.  So far, it contains over 20GB of entertainment alone - more than enough to keep me busy for a few minutes...;-)  There's plenty of room left for photos and phone movies.  Couldn't be more pleased.