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Problem
Unable to
connect to the
network
Cannot make
outgoing calls
PIN code
blocked
Unable to enter
information into
the phonebook
Phone crashes,
reboots, freezes,
or cannot be
powered on
Phone is slow or
sluggish
80
Possible causes
The nano-SIM card is invalid.
You are not within the network's
service area.
Poor signal.
You have activated Fixed Dialing
Numbers.
You have entered an incorrect PIN
code three consecutive times.
The phonebook's memory is already
full.
Some third-party software is not
compatible with your phone.
Applications are running in the
background.
Possible solution
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.
Go to Fixed Dialing Numbers and
disable it.
Contact your service provider. If
the service provider provides the
SIM card's PUK code, use the PUK
code to unlock the SIM card.
Delete unnecessary data from the
contacts.
Uninstall the software that may
cause the problem.
Upgrade the phone software.
Reset the phone to factory status.
Exit background-running
applications if they are not being
used.
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