Discover has introduced Freeze It, a security feature that lets people who misplace their credit cards temporarily suspend their accounts. Freeze It can be used as an on/off switch from a mobile app, online, or over the phone to a call center operator. Cardholders might use it if they, for example, leave their credit card at a restaurant and can’t immediately return to pick it up. Accounts are shut down in less than 10 seconds, which stops new purchases, cash advances, and balance transfers. Cardholders receive alerts if transactions are declined while their accounts are suspended. Recurr...