Though smartphones can be used to listen to music, they can't compete with high-end music players. Toward the top of that list is Sony's NW-ZX707 Walkman.
Listen to a standard mp3, then listen to the same song as 32/96k FLAC. I bet most people can hear a difference. But no worries if you can't, its not a big deal
Oh hunny...I didn't say an mp3 is CD quality, you assumed that. I gave specs for the FLAC because "standard mp3" has specs; therefore you have two sets of specs to compare, silly goose. I can hear a difference, but that's because any studio engineer that is worth their money is going to be both.