3 or more bells ranging.  But couldn't get any voice from the call

Caller ID: 3010000000
and when i rediled on above no  ,obove no was showing engned tone  .

Just the number 301 called me monday 3 times and on the 4th time i answered the call and it sounded like an older foreign male saying something then the phone hung up or they hung up, im not really sure but after i answered it the number stopped calling. Its really weird though because i did not know you could make only 3 numbers of a phone number show up. They called my cell phone and that same day i also had 3 calls from "unavailable". A girl at yahoo answers also posted the same type of thing happen. Who is this? If you know, please let me know asap.. contact me via email using my name @ hotmail . Thanks!

Whn are you

some body calling me from this no what we can do against him,

Am in Toronto. Call today from 301 - as per call display. Was curious so answered. When I picked it up, a few seconds of dead air and then a recorded female voice said Good Bye, and the call disconnected.