I'm so sorry you are having trouble making calls out. FDN stands for Fixed Dialing Number, a feature that allows users to restrict their outgoing calls and messages to selected phone numbers. If this is not resolved by rebooting the device, a new SIM card will address this concern for you. You can pick up one at a corporate store for no cost or by reaching out to us. Keep me posted if you need further assistance.
Follow us on Twitter @VZWSupport