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.
Available Exclusively at SatPhoneStore, the Iridium 300 Minute Prepaid Airtime SIM Card is loaded with 300 satellite phone minutes that can be used anywhere in the world. Lifetime of minutes is 12 Months. Reloadable, but minutes do not carry forward.