iPhone 4S being "factor" does not recognize SIM

 After many users complain about bugs and outlook negative battery "slipping" is recent, many customers use the CDMA network, said iPhone 4S not getting SIM errors.

According to Engadget, this is the case with not one but many networks in the U.S. and the world, including Verizon and Sprint.
On the Apple forums, one user said he Siri running in minutes and heat up the phone, SIM then do not get reported.
Many pages later discussion, the user also reflects a similar situation. Song seems this bug only occurs with the CDMA network.

Apple still has not responded to the incident.
Related to fix the battery drain, according to Slashgear, probably later this week Apple will release iOS 5.0.2 update to fix battery drain radical error which IOS version 5.0.1 is not "complete the services ". And at the end of the year, the update will upgrade the IOS 5.1 Siri to "her assistant" can perform many commands.