Zte Z331 User Manual page 76

Problem
Shortened.
standby.time
Unable.to.
connect.to.
the.network
72
Possible Causes
The.standby.time.is.related.to.
your.service.provider.system.
configuration..The.same.
phone.used.with.different.
service.providers'.systems.will.
not.provide.exactly.the.same.
length.of.standby.time.
The.battery.is.depleted..
In.high-temperature.
environments,.battery.life.will.
be.shortened.
If.you.are.not.able.to.connect.
to.the.network,.the.phone.
will.continue.to.send.out.
signals.as.it.attempts.to.
locate.a.base.station..Doing.
so.consumes.battery.power.
and.will.consequently.shorten.
standby.time.
(U)SIM.card.invalid.
You.are.not.within.the.
network's.service.area.
Poor.signal.
Possible Solution
If.you.are.located.in.an.area.
where.signaling.is.weak,.
temporarily.switch.off.the.
phone.
Use.a.new.battery.
Change.your.location.to.
one.where.the.network.is.
accessible,.or.temporarily..
turn.off.your.phone.
Contact.your.service.provider.
Check.the.service.area.with.
your.service.provider.
Move.to.an.open.space,.or.if.
you.are.inside.a.building,.move.
closer.to.a.window.
Troubleshooting.and.FAQs