Samsung SCH-R710XKBCRI - Manual (Page 21)

Getting Started 17
Headset Jack
Your phone includes a jack for
attaching an optional Headset or
Headphones. You can use a Headset
for hands-free telephone
conversations, or Headphones, to
listen to music or videos.
ᮣ Plug the Headset or Headphone
cable into the Headset Jack on
the top of the phone.