Samsung Galaxy A20 Notes On Usage page 28

■ Main...unit ...
• The battery for the product is built-in and cannot
be replaced by yourself. Contact an au shop or a
Customer Center to replace the battery.
• Do not forcefully press, tap or intentionally subject
the display to strong impact. Doing so might cause
scratching or damage.
• Do not forcefully press your fingernails, sharp
objects or hard objects against buttons or display
surface. Doing so might cause scratching or
damage.
• The touch panel is designed to be lightly touched
by fingers. Do not apply strong pressure with
your fingers, or sharp-pointed objects (such as
fingernails, ballpoint pens and pins) on the touch
panel.
In the following cases, the product may not respond
to touching the touch panel, or errors in operation
may occur.
- Operation with gloved hands
- Operation with fingernails
- Operation with a foreign object placed on the display
- Operation with a protective sheet or sticker on the
display
- Operation with water drops or dew condensation
attached on the display
- Operation with wet or sweaty fingers
- Operation underwater
• Never use modified product. Use of a modified
device violates the Radio Law and the
Telecommunications Business Act.
The product is compliant with rules on the technical
standard conformance of specified wireless
equipment based on the Radio Law and rules on
the technology regulatory compliance of terminal
device based on the Telecommunications Business
Act. As proof of this, the "Technical Conformity
Mark " is indicated in the product.
How...to...confirm:...On...the...home...screen,...flick...up...or...flick...
down...→...[Settings]...→...[About...phone]...→...[Regulatory...
information].
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.
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Notes...on...Usage