Our caller ID list is growing larger. Each time phone numbers such as these call relentlessly and hang up we add then to our phones as DNA1, DNA2, etc for DO NOT ANSWER! Our cell phone provider charges $3 per number to block and with the growing number of 'estranged numbers' that call us we have to deal with it. When I called this number back it says 'out of order'
Only idea as to what this might be is a random number generated auto-dialer to see if a number is in service before a telemarketer calls. As it has shown up on caller ID multiple times with no message and calling back to what I surmise is a spoofed number gets the "not is service" message.