Same thing happened to me... I was at work, glanced at my cell because I noticed it was lit up and realized I had just missed a call. Called the number right back and got a recording in a British voice indicating the # was not in service.

This number called me and left no message.  When I called back, the message said the phone number was disconnected.

Two calls received from this number at 1:31 am and 6:28 am on October 9, 2011.

Received several calls from this number, as well as 773-475-5967.  They hung up when I answered and when I called back, it said the number was not in service.

Well I've 3 calls back to back from this number. Since I was in school I couldn't answer it. So I went into the bathroom to call it back and a voice mail said that the number has been disconnected. When I went back to class they called me again. When I got out of class I called the back for about 5 minutes and heard the same voicemail message.

Found this number on my caller id 773-475-5966 mt sinai at 1:09am my ringers are off on my phones, i think it is spoofed. Don't know anyone in this area code.

i got 2 in a row from the same number on my cell around 2:20pm. didn't answer just because i didn't recognize it. the second time there was a voicemail that just played some cheesy smooth jazz. i thought it was someone i knew just messing around so i called and got the repeating "this number is not in service"... although it apparently is.
how can i harass these idiots back?

Got this call at 12:17 AM the other day. Did not have a chance to pick it up. Called a little later on in the day, I picked it up, they never talked and I just hung up. I later tried to call this number, I got a message saying that this number is not in service. The thing is, I dont kno how they got my cell number.