if i understand correctly- all scam callers do not have to actually dial your exact phone number: meaning, a computer can dial many random number combinations at once, and by chance, one number can be yours. they don't have to specifically know or dial your number. the local 'charity' callers seem to have a list of numbers they get from who knows where. but these giant scammers may not have any specific phone numbers to call, they don't need them.