Samsung SCH-R631DWACRI - Manual (Page 18)

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4. Remove the memory card from the memory card slot.
5. If desired, install another memory card. (For more information,
refer to “Install a Memory Card” .)
6. Replace the microSD cover.
Headset (Optional)
Your phone includes a jack for attaching an optional Headset/
Headphones. You can use a Headset or Headphones to hear
telephone conversations.
ᮣ Insert the Headset or Headphones into the Headset Connector
on the top of the phone.