Samsung SPH-I330 Online User's Manual page 86

Tip:
To reschedule an event, tap and drag the event to a different time or
day.
Note:
The Week View also shows untimed events and events before and
after the range of times displayed.
Tap an event to display the event description.
3.
Event Conflicts
With the ability to define specific start and end times for any event, it is
possible to schedule events that overlap (an event that starts before a
previous event finishes).
An event conflict (time overlap) displays in the Week view as overlapping
time bars and in the Day view as overlapping brackets to the left of the
conflicting times.
Section 2: Understanding Your Phone
2H: Personal Organizer 82