Review: Samsung Galaxy Attain 4G for MetroPCS
The Attain 4G uses the new Google Music media player. It has a richer feature set than the older stock player and lets you stream music that you've stored on Google's servers. I found the music streaming service didn't work at all when under 1x coverage. It did work under LTE coverage.
The Attain 4G also ships with the Rhapsody music service on board, which lets you stream music to the device for a monthly fee.
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The Attain 4G has minimal video play-back features. Only the stock Android video player and YouTube player are on board out of the box. I found that the Attain 4G handled side-loaded content (movies that I placed on the microSD card) just fine.