71
Problem
Possible causes
Possible solution
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.
Change your location to one where
the network is accessible, or
temporarily turn off your phone.
Cannot switch your
phone on
Battery power has been depleted.
Recharge the phone’s battery.
(U)SIM card error
(U)SIM card malfunction or damage.
Take the (U)SIM card to your
service provider for testing.
(U)SIM card inserted improperly.
Insert the (U)SIM card properly.
Debris on the (U)SIM card contacts.
Use a soft, dry cloth to clean the
(U)SIM card contacts.
Unable to connect to
the network
(U)SIM card invalid.
Contact your service provider.
You are not within the network’s service
area.
Check the service area with your
service provider.
Poor signal.
Move to an open space, or if you
are inside a building, move closer
to a window.
You cannot make
outgoing calls.
You have activated the
Fixed dial numbers
feature.
Go to
Settings > Call Settings >
SIM Settings > Fixed Dialing
Numbers
and disable it.
PIN Code 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
contacts.
Phone crashes,
reboots, freeze, or
cannot be powered
on
Some third-party software is not compatible
with your phone.
Reset the phone to factory status.
Enter safety mode and uninstall the
software that may cause the
problem.
Upgrade the phone software.
Emergency Number Unable to call emergency Number.
Please ensure that SIM Card is
inserted with in handsets.
Summary of Contents for N790
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