iPhone 4S and SIM card problems

               Oh yes, that's the device we are speaking about, that which created a huge sensation before the release, the iPhone 4S. Since the release the phone has been facing problems like SIRI not fully functional, battery problems and now, the newer one which is a SIM handling problem. Many users report that their device is not recognizing the SIM cards.

(Source: Google Images)

Users are receiving error messages such as SIM is invalid or not installed. Rebooting is giving them a temporary solution, according to TUAW. This may be a hardware or an OS problem or a problem with SIMs. There are also reports that the mobile is working good when replaced by a  new SIM.