Samsung A840 - Manual (Page 217)

Section 3A: Sprint PCS Service Features: The Basics 205
Sprint PCS
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Responding to Call Waiting
When you’re on a call, Call Waiting alerts you of incoming
calls by sounding two beeps. 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.