Unknown caller from Allentown, NJ who calls my cell 2-3 a day.  I've attempted to answer 2-3 times, but never another person on the other end - just silence.  Never leaves a message.  Most likely a robot caller from some affiliate of some service I have that is sharing information (that I can't get out of) as my number(s) are all registered on the 'do not call' listing, Just going to block the number going forward.