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.
Prepaid phone cards are ideal for travel because making a long distance phone call from a hotel room, airport or payphone can cost in excess of $1.00 per minute, and much more if outside of the United States of America.