Samsung WEP7 - Manual (Page 15)

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Using.call.functions
Making.a.call
Redialling.the.last.number
Press the Talk button to redial the last number.
For some phones, pressing the Talk button opens the call log list. Press the Talk
button again to dial the selected number.
Dialling.a.number.by.voice
Press and hold the Talk button, and then say a name to dial a number by voice.
Answering.a.call
When you hear incoming call tones, press the Talk button to answer a call.
Ending.a.call
Press the Talk button to end a call.
Rejecting.a.call
When a call comes in, press and hold the Talk button to reject a call.