Sanyo Katana II by Sanyo Benutzerhandbuch

There are several simple guidelines to operating your phone properly and
maintaining safe, satisfactory service.

To maximize performance, do not touch the bottom portion of your
phone where the internal antenna is located while using the phone.

Speak directly into the mouthpiece.

Avoid exposing your phone and accessories to rain or liquid spills. If
your phone does get wet, immediately turn the power off and remove
the battery. 

Do not expose your phone to direct sunlight for extended periods of
time (such as on the dashboard of a car). 

Although your phone is quite sturdy, it is a complex piece of equipment
and can be broken. Avoid dropping, hitting, bending, or sitting on it. 

Any changes or modifications to your phone not expressly approved in
this document could void your warranty for this equipment and void
your authority to operate this equipment. 

For the best care of your phone, only Sprint-authorized personnel
should service your phone and accessories. Failure to do so may be
dangerous and void your warranty.