String literal. A string literal or anonymous string is a type of literal in programming for the representation of a string value within the source code of a computer program.
As usual, the devil is in the details. For instance, with some prepaid wireless plans, your minutes are only good for a limited time, usually 30 to 90 days. If you don't use them before they expire, they are simply subtracted from your account anyway.
I'm sure a lot of people have run into this. If you have a prepaid visa, amex, etc. with a low balance and you forget about it in your wallet or drawer. You find it 6 months later only to realize the card just expired. Don't be a dummy, do this instead: Check the back of your card for a phone number or website that allows you to check the exact card balance.