Zte Z815 User Manual page 32

Upgrading the Phone Software
There are several ways to upgrade your phone software:

Use the online upgrade tool for mobile terminal products.

Use the one-press upgrade package offered by your mobile
service provider.

Use the upgrade package on your microSDHC card.
NOTE:
Visit the ZTE official handset service support website
(http://www.ztedevice.com/support) and click your country or
region to learn more about the above upgrade methods, as well
as which phones and methods are supported.
Problem Possible causes
Poor local telephone line
quality.
Unable to Your service provider does
select certain not support these features,
features or you have not applied for
services that provide these
features.
Battery not The battery or battery
charging charger is 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
standby time 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
hightemperature
environments, battery life
will be shortened.
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Possible solution
End the call and dial again.
You may be switched to a
better-quality network link or
phone line.
Contact your service
provider.
Contact the dealer.
Adjust the battery charging
environment to avoid
extremes of temperature.
Check all connectors to
ensure that 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.
127
Troubleshooting
If you encounter problems while using the phone, or if it
performs abnormally, you can refer to the chart below. If your
particular problem cannot be resolved using the information in
the chart, contact the dealer where you purchased the phone.
Problem Possible causes
Poor reception The network signal is too
weak at your current
location, for example, in a
basement or near a tall
building, because wireless
transmissions cannot
effectively reach it.
The network is busy at the
current time (for example,
during peak times, there
may be too much network
traffic to handle additional
calls).
You are too far away from a
base station for your service
provider.
Echo or noise Poor network link quality on
the part of your service
provider.
Problem Possible causes
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.
Cannot turn Battery power has been
your phone on depleted.
micro-SIM micro-SIM card malfunction
card error or damage.
micro-SIM card inserted
improperly.
Debris on the micro-SIM
card contacts.
Unable to micro-SIM card invalid.
connect to the
network
You are not within the
network's service area.
Poor signal.
Cannot answer You have activated the Call
incoming calls barring feature.
Cannot make You have activated the Call
outgoing calls barring feature.
Possible solution
Move to a location where
the network signal can be
properly received.
Avoid using the phone at
such times, or try again after
waiting a short time.
You can request a service
area map from your service
provider.
End the call and dial again.
You may be switched to a
better-quality network link or
phone line.
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Possible solution
Change your location to one
where the network is
accessible, or temporarily
turn off your phone.
Recharge the phone's
battery.
Take the micro-SIM card to
your service provider for
testing.
Insert the micro-SIM card
properly.
Use a soft, dry cloth to clean
the micro-SIM card
contacts.
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.
Disable this feature. See
Bar Certain Calls.
Disable this feature. See
Bar Certain Calls.
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