This problem occurs on all operators and prevent users from activating the phone if the SIM card in the slot. Remove the SIM card showed up to fix the problem, at least for a while, but running a phone without a SIM card would harm important data backup.
Continuation of the problem can open the door for competitors such as Android and BlackBerry, which can obtain the clientele who fled fearing more problems were found in iPhone 4S. For example, the failure of this card News recently coming at the same time Samsung launches Nexus galaxies in United Kingdom and the customer in the United States may purchase their next heavy devices.