Over the last few days, I have had 4 different persons call me to say they had received a call from my cell phone number. I had neither called them nor had my phone been out of my sole possession. The outgoing calls to these strangers were not listed on my cell call log. I went to my local AT&T store and they replaced my SIM card. I just received a 5th call from someone who received a call from my phone, so that means the new SIM card didn't make a difference. I heard there was a website to report such phantom calls. Thoughts?