Samsung MM-A940 - Manual (Page 221)

Section 3A: Sprint PCS Service Features: The Basics 195
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Responding to Call Waiting
When you’re on a call, Call Waiting alerts you of incoming
calls by sounding one beep. Your phone’s screen informs you
that another call is coming in and displays the caller’s phone
number (if it is available and you are in digital mode).
To respond to an incoming call while you’re on a call:
ᮣ
Press . (This puts the first caller on hold and
answers the second call.)
To switch back to the first caller:
ᮣ
Press again.
Tip: For those calls where you don’t want to be interrupted, you
can temporarily disable Call Waiting by pressing *70 before
placing your call. Call Waiting is automatically reactivated
once you end the call.