How do I report my card lost or stolen? If your credit or debit card is missing, don’t assume it will resurface. Report your card immediately by calling: (833) 933-1681 (domestic) (812) 647-9794 (international) With the CU1 Mobile app, you can also "turn off" your CU1 debit or credit card at the touch of a button via your mobile device. Explore Mobile Banking