Samsung SPH-I330 - Manual (Page 136)

Section 2: Understanding Your Phone
2N: To Do List 132
Setting Priorities
Different priority levels can be set for the To Do List items, based on their
urgency. The items are displayed by priority and due date at the top of the
screen by default. The number “1” is designated as the highest priority.
Changing the items priority automatically repositions the item in the list.
Setting the Priority Level
1. Tap the Priority number on the left side of the item displayed in the
To Do List.
2. Tap the priority number from “1 - 5” on the drop down menu.