I want to add ADDRESS to one of my contacts. I can "add a field" and it works fine. Then I choose another contact, and I can't get that option. Why is that?
Check where these both contacts are coming from. Some services might support a set of features, some not. For example, in our feature phones, the contacts stored in SIM card could only save one phone number per contact, while the ones stored in phone could store multiple phone numbers along with other details as well.