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Problem
Possible causes
Battery not
The battery or battery charger is
charging
damaged .
The phone's temperature is below 0°C
or higher than 45°C .
Poor contact between the battery
and charger .
Shortened
The standby time is related to your
standby time
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 .
Battery power is consumed in a
variety of ways, including sending
out signals to locate a base station
when you are unable to connect to
a network .
Cannot turn
Battery power has been depleted .
your phone on
SIM card error
The SIM card has malfunctioned or is
damaged .
SIM card inserted improperly .
Debris on the SIM card contacts .
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Possible solution
Contact the dealer .
Adjust the environment to avoid
extremes of temperature .
Check all connectors to make
sure all connections have been
properly made .
If you are located in an area
where signaling is weak,
temporarily power off the phone .
Use a new battery .
Turn off Wi-Fi, GPS, and Bluetooth
if they are not being used . You
can also adjust your screen
brightness and timeout duration
in Settings > Display .
Recharge the phone's battery .
Take the SIM card to your
service provider for testing .
Insert the SIM card properly .
Use a soft, dry cloth to clean the
SIM card contacts .
TROUBLESHOOTING
Problem
Possible causes
Unable to
The SIM card is invalid .
connect to the
You are not within the network's
network
service area .
Poor signal .
Cannot answer
You have activated the Call Barring
incoming calls
feature .
You have activated the Call Barring
Cannot make
outgoing calls
feature .
You have activated Fixed Dialing
Numbers .
PIN code
You have entered an incorrect PIN
blocked
code three consecutive times .
Unable to enter
The phonebook's memory is already
information into
full .
the phonebook
Phone crashes,
Some third-party software is not
reboots, freezes,
compatible with your phone .
or cannot be
powered on
Device is
Your phone is allocating memory to a
sluggish or
large number of apps running at the
responds slowly
same time .
TROUBLESHOOTING
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 Call Barring Settings, and
then select Deactivate All .
Go to Call Barring Settings, and
then select Deactivate All .
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 .
Go to Task Manager and close
apps that are not being used .
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