As a newbie who has just purchased a Samsung S3 mini I do not know how to download music to my memory card in order to listen to music offline.

Could you advise which app download from the app store as currently I am "working blind" - my phone is syncing on my pc but I cannot see what is actually happening on the phone .

I am thinking of switching from O2 to Giff Gaff to gain unlimited streaming.  It is an o2 subsidiary.  Good or bad idea do you think?  I thought this might solve the hassle of constantly downloading.  When they say "unlimited internet" do they mean "unlimited data allowance" - and would this also lead to the drop out problem if I stream in my car as opposed to downloading to an SD card.

I am hoping if I manage this I can do the same with Google Play and leave Itunes forever.

Any opinions?  Cheers.