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.
1 If you want to check your prepaid balance, enter #999# and send the call. 2  Check your minutes: Enter #MIN# (#646#) and send the call.  If you have a prepaid account and want to check your remaining minutes, enter #999# and send the call. Minutes when roaming may take up to 30 days to post.