Samsung MM-A940 Owner's Manual page 246

How do I know when my phone is connected to Sprint PCS Vision
services?
Your phone automatically connects when Sprint PCS Vision
service is used or an incoming message arrives. Your phone
will also display the
which Sprint Power Vision service is available, you will see the
icon.
Can I make calls and use Sprint PCS Vision services at the same
time?
You cannot use voice and Sprint PCS Vision services
simultaneously. If you receive a call while Sprint PCS Vision
service is active, the call will be forwarded to voicemail. You
can place an outgoing call anytime, but it will interrupt any
in-progress Sprint PCS Vision session.
When is my data connection active?
Your connection is active when data is being transferred.
Outgoing calls are allowed; incoming calls go directly to
voicemail when 3G is active. If EVDO is active, the call will
ring through before going to voicemail. When active, the
or
When is my data connection dormant?
If no data is received for 10 seconds, the connection goes
dormant. When the connection is dormant, voice calls are
allowed. (The connection may become active again quickly.) If
no data is received for an extended period of time, the
connection will terminate.
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indicator. When you enter an area in
indicator flashes on your phone's display screen.
Section 3B: Sprint PCS Vision