After creating a Zing account you will have an option to sync your phonebook. This lets you add contacts who are Zing members as payees so you can send and receive money with friends quickly and easily.
Only contacts who have a Zing account and made themselves discoverable in the app will be synced. Turn on ‘Make me discoverable’ so Zing members can find you if they have you as a contact. You’ll also need to give Zing permission to access your contacts. You can do this in your phone settings. You can change your permissions at any time.