CB24 Credit Card App is the best way to get the most from your Citizens Bank debit cards. ? Clearly see your purchases with cleaned up merchant names, location on a map and store info. ? Keep a close eye on your spending with spend summaries to see where you?re using your card online and in-store. ? Get 24-hour self-service at your fingertips. Activate cards, tell us when you?re traveling and report cards lost or stolen. ? Stay in control with real-time alerts and controls. Lock your card, set spending limits and determine where your card can be used.