Samsung Galaxy Note9 Basic Manual page 26

If the modifications are made to the internal components,
the certification of conformity with technical regulations
will become invalid. Never use the product without the
valid certification. Doing so violates the Radio Law and the
Telecommunications Business Act.
• Take care not to place magnetized items such as magnetic
cards, speakers and TV sets near the product, as it might
cause malfunction. Putting a strong magnetism close to the
product might cause false operation.
• Do not bring the product close to magnetized objects such as
cash cards, credit cards, and prepaid cards. Doing so might
result in loss of recorded information.
• When you put the product in your pocket or bag, take care so
that the display does not come in contact with metal objects
or other hard objects, as it might cause scratching or damage.
• When suddenly brought into a warm place from a cold place,
or when in a humid location, or when used where temperature
suddenly changes (e.g. near the air discharge port of an air
conditioner), water droplets (i.e. condensation) sometimes are
formed inside the product. Note that when used under conditions
such as this, the humidity might cause corrosion or a fault.
• Do not exert excessive force when attaching/removing a microSD
memory card. Doing so might injure your hands or fingers.
• While writing/reading data to/from a microSD memory card, do
not subject the product to vibration or impact, or turn off the
power. Doing so might cause loss of data or a fault.
• Do not cover the proximity/light sensor with your finger or
put a sticker on it. Doing so may hinder it from detecting the
ambient brightness and functioning correctly.
• Do not put a sticker, etc., on the proximity/light sensor. Doing
so may cause the sensor to malfunction and make the display
always turned off while receiving a call or during a call.
• Normally, keep the au IC card/microSD memory card tray
closed when using the product. Otherwise, dust or water may
enter the product interior and may cause malfunctions.
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• Do not put liquids, metals, or other foreign objects into au IC
card/microSD memory card slot of the product. Doing so may
result in a malfunction.
• Do not subject to strong impact, such as dropping, stomping
and throwing. Doing so might cause fault.
• Do not put the product directly on sand at a beach, etc. Sand
or other small particles might get inside the receiver/speaker,
the mouthpiece, the speaker, etc., causing the volume to drop.
If sand gets inside this product's main unit, it might cause
fault.
■ Touch Panel
• Do not put stickers or sheets (e.g. commercially available
protective films, peep prevention sheets) on the display. Doing
so might hinder correct operation of the touch panel.
• When carrying the product in your pocket or bag, take care
not to put the touch panel close to metals or other conductive
materials, as it might cause false operation of the touch panel.
■ Organic EL (OLED) display
• Although lightning intensity of OLED can be decreased partly
when the same image has been displayed for a long time,
the brightness set to bright more than necessary or using
extremely for a long time. It is not abnormal because that is
the characteristic of OLED.
• Although the OLED display used on the product is made using
high-precision technology, some pixels (dots) might be lit or
out at all times. Or color may be changed or unevenness of
brightness may be shown if looked at from different angles.
Note that that is because of the structure of OLED display,
not a fault.
• Leaving the OLED exposed to the direct sunlight might cause
a fault. Take care when you place the product by the window
or outside.