Haier U50 Instruction Manual page 58

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Signal at your location is weak so that the cell phone has to search signal for a
long time. When you don't want to answer any call, please power off for a time
being. It is also possible that the battery has been used for a long time and
approaches its life-span. In this case, please replace the battery.
Cell phone fails to boot:
Check battery volume or charge the battery. Try to power on while charging. If
your cell phone is put off for a long time, the battery is likely to discharge
excessively. You cannot power on it in this case, and the phone will give no
response for quite a long time. The phone cannot be powered on until battery is
restored.
Can not send short message:
Please check your service center number option to see if you have set up
service center number or if the number is correct. Perhaps you have not open
SMS service, or recipient of short message is invalid, or network service
operator of your region does not support this service.
Can not charge:
There are three possibilities: 1. Charger of your cell phone does not work
properly. You can contact nearest service provider or dealer appointed by Novo;
2. Ambient temperature is not appropriate. Please change charging environment;
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