sounds similiar to email spam viruses that send themselves out using your address. maybe it's the same thing with your phone.
I got my number canceled so the calls should stop, at least from my number.
So this is my cell phone number and I've gotten over 100 calls today from people who have been called from it. I don't know what is happening, but somehow someone is using my number but not my phone to call.
I'm working on getting my number canceled so this will stop.