How do I add the phonetic contact fields to a contact on iOS 5 when using an iPhone 4? Recently I have seen some interesting tips for increasing the accuracy of Siri by entering phonetic details for contacts with names that is has trouble understanding or saying correctly.  

This involves editing a contact, adding a new field, then selecting either phonetic first name or phonetic last name. E.g. Shuvawwn instead of Siobhan.

While I do not have Siri as I run an iPhone 4 not 4S, I have still seen these tips pre-dating iOS 5 to help with voice control as was before Siri came along.

The problem is that I do not appear to have these fields available on my iPhone at all.

How can I get them to show?  Is there some language or accessibility setting or other required to get them to appear?
I can confirm after testing that these fields are not available on the iPhone 4 in iOS5, although they are available on the iPhone 4S.

However, if you have your contacts synced with Address Book on the Mac, you can add the field to the contact card via the Add Field menu item under Contact, and the field is then sent to your iPhone on the next sync. I am not able to confirm if you can do this via the iCloud web interface directly.