I just got a call from that number and it was Verizon Business.  It was a call about my business account (billing dispute, but being handled professionally by them so far)  that would explain the access to the phone bill mentioned earlier.

had 2 calls just before 5:00 am, wanted me to accept collect call from a ylonda from the phillipines. said no and hung up. then few minutes later called back with this number showing on caller id, they said nothing then hung up. few minutes later the same thing happened again. 03/18/2008

I had a call from this number this morning saying they were calling from Verizon and asking me if I had made calls to Ireland and did I have any other verizon phones. I stupidly answered some of their questions but got worried when i hung up.  Rang Verizon and they knew nothing about it no one was due to call me and there was no record of anyone from them calling me on our account.  If they call you tell them nothing and ask if you can call them back to verify.  Worrying that someone had that kind of information on my calling patterns.  

Just tell them nothing

This number called my office phone at 9:00 pm.  No message,just hung up.

This number called me at friggin 5:30 this morning.  Didn't answer and they didn't leave a message.  Very strange that all this info is on one #.