I want to buy a cheap android phone to use as a mp3 player.

I want to buy a android that I can run apps and play mp3 via bluetooth. I don’t really care about the phone part too much but would prefer some type of prepaid plan in case I decided to activate it.

I basically want the phone for its pocket computer abilities. I am about to get a Straight Talk LG L34C.
Does anyone have any advice about why this would or wouldn’t work. If I am choosing a really bad phone, what would be a better choice?