Samsung SOUL SGH-U900 - Manual (Page 45)

using basic functions
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Use basic call functions
Use the speakerphone feature
During a call, press [ 1. ] → < Yes > to activate the
speaker.
To switch back to the earpiece, press [ 2. ] again.
Use the headset
By plugging the supplied headset to the phone’s
multifunction jack, you can make and answer calls:
To redial the last call, press and hold the headset button, •
and then press and hold again.
To answer a call, press and hold the headset button. •
To end a call, press and hold the headset button. •