iPhone Bug

This is probably the weirdest thing that ever happened to me on a phone, not just on a iPhone.

Today I was sitting next to a friend, both of us with iPhones. I was using the new Yahoo Messenger app while he was streaming radio over 3G. Meanwhile another person, outside of the building, with another iPhone sent HIM an SMS message. Now here comes the weird part: I received the message, and it displayed it with the contact info from my friend's phone. And I didn't even have that person's number on my cell!

Most people would jump and say it was addressed wrong or that I was using the other phone, but I wasn't and it wasn't. When the 3rd person came by, we all checked the addressing ( which was a reply to an earlier message), the numbers and everything.  When I checked my SMS app, the message was gone, it was never saved, nor opened, only displayed. Everything was correct, but I got the info/sms and my friend didn't receive anything. 

We then proceeded to test the phones in different scenarios to try and recreate the bug but we couldn't. I checked around the net for anything related to this but it seems this is the first ever.

PS: here's some info on the phones: all of them are 3g phones, my friend's and the 3rd person's being jailbreaked while mine is legitimate.

 If anyone hears anything about this I'd appreciate a reply or something. Cheers