Found an awesome deal on craigslist. Some guy having some $ issues had a 1 week old GS3 and I bought it for $250. Had the IP5 and I sold it for $500. So at the end of the day I made $250 and got the GS3 for free. 
I have a few questions and issues that I need help with:
-Downloaded Samsung kies so that I can transfer everything from my Iphone over to the GS3 but all my music went into the stock samsung music player instead of google play music. Eventually I figured out how to upload all the song to google play music but now I cant figure out how to delete them from the stock music player so that I can free up space on my phone.
-All my songs that I have on google play have random pics from my photo album. WHY? There should be no reason why there are pics of my dog on the album cover of certain downloaded songs that I have on my playlists.
-Lastly, when I'm home and connected to my wifi network but also have my mobile data enabled, which is actually being used? Should I disable my mobile data when connected to wifi to avoid using up my 2GB of data that I'm allowed under my VZW plan, or is it not being used when I'm connected to wifi?

I have a few questions and issues that I need help with:
-Downloaded Samsung kies so that I can transfer everything from my Iphone over to the GS3 but all my music went into the stock samsung music player instead of google play music. Eventually I figured out how to upload all the song to google play music but now I cant figure out how to delete them from the stock music player so that I can free up space on my phone.
-All my songs that I have on google play have random pics from my photo album. WHY? There should be no reason why there are pics of my dog on the album cover of certain downloaded songs that I have on my playlists.
-Lastly, when I'm home and connected to my wifi network but also have my mobile data enabled, which is actually being used? Should I disable my mobile data when connected to wifi to avoid using up my 2GB of data that I'm allowed under my VZW plan, or is it not being used when I'm connected to wifi?