Is the use of "not" in this sentence correct or not?
Don't communicate until the phone line is not fully secured.
Kindly advise.
Is the use of "not" in this sentence correct or not?
Don't communicate until the phone line is not fully secured.
Kindly advise.
Well, you have a double negation in your sentence, so you're basically saying "wait for the phone line to be unsecure/unsafe, and then start communicating". From a grammatical standpoint, that sentence is 100% correct; there's nothing wrong with it. But, that's probably not what you meant to say (who would want to communicate over a dangerous, unsecure phone connection?). What you probably meant was, "wait for the phone line to be secure, and then start communicating". In that case, you would write:
Don't communicate until the phone line is fully secured.
EDIT: changed "insecure" to "unsecure"