Samsung SM-R3810ZAAXAR - Manual (Page 43)

Health/Safety Information 36
Cautions
Any changes or modifications to your mobile
device not expressly approved by Samsung
could void your warranty for this equipment
and void your authority to operate this
equipment. Only use approved batteries,
antennas, and chargers.
The use of any unauthorized accessories
may be dangerous and void the mobile
device warranty if said accessories cause
damage or a defect to the mobile device.
Although your mobile device is quite sturdy,
it is a complex piece of equipment and can
be broken. Avoid dropping, hitting, bending,
or sitting on it.