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.
MetroPCS is now selling prepaid calling cards exclusively at Walmart. The By the Minute cards are available in two options: a $20 card comes with 500 voice minutes, or 4 cents per minute, and a $30 will entitle you to 1,000 minutes, or three cents per minute. For both cards, you can use the calling minutes at anytime.