Maximum number of custom labels in AddressBook for iPhone?

How many custom labels can we add in a contact in the AddressBook for iPhone programmatically?

I tried to add more than one 开发者_高级运维label in but it is showing me only one custom label in a particualar contact. Is there any limitation provided in the iOS SDK that we can't add more then one label for a contact in the address book?

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There's no restriction, you'll only see one label for a particular value, so you'll need to make your own view (controller) to choose or change it - you see this in the Contacts app.