You can change the tabs (Dial, Recent, Contacts, Favorites, and Groups) at the top of the Phone application.
From the Home screen, tap the Phone Key in the Quick Keys bar.
Tap the Menu Key > Edit tabs.
Drag a tab handle to move it to the position where you want it in the list.
Tap the Favorites or Groups checkbox to remove the checkmark and delete it from the Phone application tabs list. Checkmark it to display it in the tab list again.
When you're finished making changes, tap Save.