I currently have a Cowon J3 and I want to buy a smartphone soon that will completely replace the J3.
Now I have to add that I want a used smartphone and I don't want the latest/best one, just one for looking up stuff, sending the occasional email and whatsapp. But since it replaces my J3, audio quality should be rather good (I have Sure SE110 in-ears).
It is also important that its memory can be extended by microsd or similar to at least 32 GB.
Could you please make some recommendations so I can browse the market places in forums and/or Ebay without feeling completely lost? Thanks!