Samsung SCH-3550 - Manual (Page 25)

Note: The no service indicator will always appear
when you turn on your phone. This is not a problem;
as soon as service is found, the indicator disappears.
Roaming: This icon displays when the phone is
outside your carrier’s coverage area and receiving
service from another carrier’s network.
Message indicator: This icon indicates you have
message(s) waiting. The message(s) can be voicemail
notification (VMN), page, text, or MiniBrowser
message(s). Press
to see the Message Menu, or if
setup with your service provider, you can press and
hold
to be connected to your voicemail service.
Analog mode: This icon indicates that the phone is
operating in analog mode. Your phone will be able to
place and receive calls where roaming agreements
exist, but quality will be similar to calls on other analog
cellular networks. Your phone has some features that
do not work when in Analog mode; these services
include Voice Memo, Voice Dialing, the Web Browser,
and certain message services.
Vibrator on: This icon indicates that an incoming call
will vibrate the phone rather than ring it. This feature
can be used for quiet situations where you don’t want
your ringer to disturb others or for loud situations
where the ringer cannot be heard.
Battery strength: This icon is always displayed when
your phone is on, and shows the level of your battery
charge. The more black bars you see, the greater the
charge. Three bars (as shown here) indicates that your
battery if fully charged. When the battery becomes
very low, an empty box appears and the phone flashes
an alert; this indicates your phone is about to turn itself
off.