Samsung A640 - Manual (Page 222)

200 Section 3B: Sprint PCS Vision
Sprint PCS Vision Connection Status and Indicators
Your phone's display lets you know the current status of your
Sprint PCS Vision connection through indicators which
appear at the top of the screen. The following symbols are
used:
Your Sprint PCS Vision connection is active (data is
being transferred); the transmit/receive symbol will
blink to indicate data transmission. Incoming voice
calls go directly to voicemail; outgoing voice calls
can be made, but the Sprint PCS Vision connection
will terminate.
Your Sprint PCS Vision connection is dormant. (No
data is being sent or received.) Though not
currently active, when dormant the phone can
restart an active connection quickly; voice calls can
be made and received.
Your phone is not currently able to access
Sprint PCS Vision service features.
If no indicator appears, your phone does not have a current
Sprint PCS Vision connection. To launch a connection, see
“Launching a Sprint PCS Vision Connection” on page 197.