MacObserver this week posted an absolutely awesome tip detailing how to auto-dial phone numbers with extensions into your iPhone address book.
Forget having to remember someone's extension number, or trying to keep it handy and accessible with a note, iOS 6 takes care of all the dirty work for you.
To get started, go to the contact info of someone with an extension or create an entirely new contact. Hit the "Edit" button in order to make changes to the contact's information page.
When you attempt to edit a contact's phone number, you'll be presented with the following screen.
