AT&T Z331 - Manual (Page 13)

Powering Phone On/Off
Note:.Do.not.turn.your.phone.on.in.areas.in.which.wireless.phone.use.is.not.
permitted,.or.when.it.could.cause.interference.or.danger.
Hold.the.Power/End Key.to.turn.your.phone.on.or.off.
Tips:
•. .When.prompted,.enter.your.PIN.(Personal.Identification.Number).code.or.
handset.code.and.press.the.OK Key.
•. .The.PIN.code.is.the.password.provided.by.your.network.service.provider...
You.cannot.use.the.SIM.card.without.it.
•. .When.the.PIN.code.or.handset.code.is.accepted,.the.phone.automatically.
searches.for.the.network..After.a.few.seconds,.your.phone.displays.idle.mode.
7 Getting.Started