Wireless Network Coverage Indicators - Blackberry Pearl 8100 Reference Manual

Wireless network coverage indicators

Indicators on the Home screen display the wireless coverage level for the area in
which you are using your BlackBerry® device. A low wireless coverage level might
limit the use of some device features.
You can use the phone, send and receive email, PIN, SMS text, and MMS
messages, and use the browser with a high-speed data connection.
You can use the phone, send and receive email, PIN, SMS text, and MMS
messages, and use the browser.
You can use the phone and send and recieve SMS text messages.
You can only make emergency calls.
The connection to the wireless network is turned off
You are not in a wireless coverage area.
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