Move contact to another group
How can I move a contact from one group into another group on my iPad mini?
iPad mini Wi-Fi, iOS 7.0.4
I do not know how this can be done directly as well, however you can share the contact sending it as email, remove the original and save it again. Make sure that in "settings"the preferred addres book is set correctly. It is combersome but the only way to do it I think.