HTC PG06100 User Manual page 184

example, when you are opening a Web page);
when the triangles are gray, your device is
connected to the network but is not currently
transferring data (for example, when you are
viewing a Web page that is completely open).
In either state, you can receive incoming calls.
Your device is on and is connected to the
1xRTT data network. When the arrows are white,
your device is transferring data (for example,
when you are opening a Web page) and you
cannot receive calls. When the arrows are gray,
your device is connected to the network but is not
currently transferring data (for example, when you
are viewing a Web page that is completely open),
and you can receive calls.
If you do not see an indicator, your device does not
have a current data connection. To launch a
connection, see "Launching a Web Connection."
172 3B. Web and Data Services