I think this comes up when someone calls from Toronto using a calling card

on sunday feb.1.2009 @ 3:13pm someone called my cell phone, as soon as i answered my phone the person hung up. when i called back all i got was a dial tone.

Call to my cell phone. I didn't answer. No message.

Received this call tonight...did not pick up, did not leave a message.
Ontario 9:10 pm

Multiple calls all day from this number. No messages are left. When they do, its only clicking. No voice.  This number has been calling me repeatedly since 1pm at least every 10 to half hour. WTF?

I to just received a call from (519) 763-5000 and when answered just hung up.  After researching the number, it appears to belong to Distributel