That only prevents people from looking you up in the White Pages, either printed or online versions. That does nothing to stop dialers that start with xxx-xxx-0001 and call all numbers in sequence and also ignore the DNC laws. Also, if your number is known to your employer and they have elected to participate in Equifax's employment verification program then your number can be found by those able to use that service.
DISTURBING CALLS FROM THIS PHONE NUMBER.......FLORIDA AREA CODE ..........NO ONE THERE
ASSUME THAT IT IS A SALES CALL SINCE I AM REGISTERED ON THE PA "DO NOT CALL" LIST AND BY LAW NOT TO BE CALLING ME