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.
Unfortunately, every time you check your voicemail from your device you use your prepaid minutes. Understanding how to check your messages from a secondary device is a great option for avoiding extra unneeded fees.