AT&T Z331 - Manual (Page 17)

Idle Mode
After.powering.on.the.phone,.when.the.name.of.the.network.is.displayed.on.the.
screen,.the.phone.is.in.idle.mode.and.ready.for.use..The.display.has.4.areas:
Indicators and Icons
11 Getting.Started
Indicators.and.Icons.area
Time.and.Date.area
Text.and.Graphics.area
Soft.key.function.indicators
Indicator What it means
Signal.strength
3G.network.
EDGE.network
GSM.network.
Indicator What it means
New.SMS.
New.MMS.
New.Email.
New.voicemail.