Been getting calls all week from this number also.  They do not leave a message but wait jus tlong enough for it to beep so it says I have a message.  Who is it?

2 calls today -- never had this #, but isnt it interesting that I blocked calls from other "strange " numbers earlier today, and now get this 1 -- both times no message was left on answering machine - - considering its a Pa number -- I just blocked today the 610-000-0000 number which had been calling every couple of days for about a montht