Why is it that when I prefix a number with 141, to conceal my telephone number. I frequently get the message, "The number has not bee recognised"? I know the number is correct and does exist, particularly if I recall the number on my phone and try again. It normally will succeed on the second or third attempt.
While I do eventually get through , it is very irritating to have to go through this process for most of the calls when I need to withhold my number.