AT&T Z331 - Manual (Page 79)

73 Troubleshooting.and.FAQs
Problem Possible Causes Possible Solution
PIN.code.is.
blocked
You.have.entered.an.incorrect.
PIN.code.three.consecutive.
times.
Contact.your.service.provider..
If.the.service.provider.
provides.the.(U)SIM.card’s.
PUK.code,.use.the.PUK.code.
to.unlock.the.(U)SIM.card.
Unable.to.enter.
information.
into.the.phone.
book
The.phone.book’s.memory.is.
already.full.
Delete.unnecessary.data.from.
the.Directory.