[AC Question]

Want to buy but would like to use anything I already have on hand.

[Rukbat]

Yes, both for stereo (multimedia) and handsfree, and it's the standard 3.5mm jack. (I can't tell which question you're actually asking so I answered both.)

But remember, the phone has about 157MB of user-available storage as it comes, so install a few apps and you're out of app space.