I have a new 8830, and i got an adapter so i can use my headphones, though i cannot seem to get the music to play out of the headphones. When i plug them in it continues to play out of the speakerphone, i hit menu and can turn it to handset..though then it just plays out of the handset and not the headphones.
Ok figured it out,
You have to have an adapted with a built in mic...or headphones with a built in mic.
Either way there has to be a mic involved, this is so if people call, the music will stop and you can talk.
Wal-mart has the adapter for $15 bucks. They are really cheap on ebay, probably around 5 bucks with shipping.