The recently put on sale smartphone iPhone 4S, in addition to rapid battery discharge discovered another common mistake. Smartphone said that the SIM card is not installed or used "Invalid SIM card".
At the moment it is unclear what the nature is a problem. This situation can occur due to a hardware error and due to bugs in the code firmware. Just do not exclude the option of the sale of defective batch of SIM cards.
First, in this situation helps to reboot your smartphone, but is said to users after a while, and this method is no longer valid. In the end smartphone refuses to detect the SIM card, even after rebooting.
Apple does not recognize the problem and refused to comment on this situation.
Source: ®
