Did you know that the iPhone is the only mobile device that actually has a SIM card tray?
All you need to do is simply insert a paperclip into a small hole and out will pop a piece of plastic which has been designed to hold your SIM card, lay your SIM inside, shove the tray back to it’s original position and away you go.
We have a photo which appears to depict the SIM card tray for the next iPhone. According to China Ontrade the tray comes directly from Foxconn and measures 3.22 mm taller and 21.7 mm wide than the SIM card tray already in the iPhone 3GS, which could well indicate an iPhone with a larger screen may well be about to be released. Source – intomobile.com