on999Phone providers display 999-999-9999 when a number cannot be captured. There are a few reasons why this could be: The caller blocked their number from showing up on your caller ID using codes such as *67 or #31#.If you're in danger, call 999 and try to speak to the operator if you can, even by whispering. You may also be asked to cough or tap the keys on your phone to answer questions.