Zte GRAND X4, Руководство пользователя

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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 Possible solution
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.
Move to a location where
the network signal can be
properly received.
The network is busy at the
current time (for example,
during peak times, there
may be too much network
traffic to handle additional
calls).
Avoid using the phone at
such times, or try again after
waiting a short time.
You are too far away from a
base station for your service
provider. You can request a service
area map from your service
provider.
Echo or noise
The network link quality is
poor on the part of your
service provider.
End the call and dial again.
You may be switched to a
better-quality network link or
phone line.