Favorites gives you quick access to your most-used phone numbers.

Add a contact’s number to your favorites list:
Tap Contacts and choose a contact. Then tap “Add to Favorites” and choose the number you want to add.
Add a recent caller’s number to your favorites list:
Tap Recents and tap next to a caller, then tap “Add to Favorites.”
Go to favorites:
Double-click the Home button.
Call a contact from your favorites:
Tap Favorites and choose a contact.
Delete a contact from your favorites:
Tap Favorites and tap Edit. Then tap next to a contact or number and tap Remove.
Reorder your favorites list:
Tap Favorites and tap Edit. Then drag next to a contact to a new place in the list.