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 service is a wireless option that lets you pay in advance for monthly, per-minute or per-text usage on your mobile device. There's no credit check, deposit or long-term contract required like you'd have with a standard monthly account (which gives you a bill for your usage at the end of each month).