Samsung SGH-D307MSACIN - Manual (Page 31)

Section 2: Understanding Your Phone 31
Selecting Functions and Options
Section 2
In some functions, you may be asked for a password or
PIN. Enter the code and press the OK soft key or the
key.
When you access a list of options, your phone highlights
the currently active option. If, however, there are only
two options, such as On/Off or Enable/Disable, your
phone highlights the option that is not currently active, so
that you can select it directly.