I got my phone a few months ago in the US. I used it just fine, made calls, texts, took pictures, everything, never had a problem. I then went to England for 6 months. I only used it with Wi-Fi there. Now that I've come home, I decided to look into getting a newer phone. My phone has been working perfectly fine since I've been back. I was going to put it on eBay, but when I ejected the tray where the SIM should be, just checking things out, there wasn't one. That was the first time I'd ever looked in there. Why was I able to make calls and text and use internet, etc? Even now it still works fine. Do all iPhones come with a SIM card? Is this weird? What should I do? Wtf?