They didn't allow it from day one. GPS apps, for example, couldn't navigate to contact addresses. VOIP couldn't use your numbers.
It was relaxed later. I don't recall exactly when, but I'm thinking around 3.2 or so. Before whatever update, you had to have silos of contacts. After it, all apps could use your address book.
It was relaxed later. I don't recall exactly when, but I'm thinking around 3.2 or so. Before whatever update, you had to have silos of contacts. After it, all apps could use your address book.