This user manual provides information on the usage precautions and emergency services for the NEC N840 mobile phone, first edition, released in December 2004.
The manual begins with emergency service information and extensive safety precautions for everyday use, travel, aircraft, hospitals, and road environments. It explains how to handle the phone safely, avoid damage, and comply with regulatory requirements.
Later sections describe the phone's menu navigation, shortcut keys, and preparation steps before first use. The final chapters cover repair procedures, warranty information, and a list of common problems with suggested solutions. This manual is written in Chinese.
The signal may be weak because the phone is far from the base station or blocked; try moving near a window or balcony.
Clean the card contacts, as the error can be caused by dirty card contact points.
The battery may be deeply discharged; after connecting the charger, wait a short time for the charging status to appear.
The phone may be in car mode; switch it back to the normal mode to turn off the constant backlight.