My iPhone is not working after the update: SIM is not recognized.
It is a problem with the mobile software... Just go to the outlet from where you bought it... Or the nearest i-Phone Outlets.... It is not a problem with the Update.
If you have problems with the update, try using iTunes then select your iPhone and click Restore. During the update process, iTunes created a backup to be used in cases of emergency. Restore the iPhone's firmware and then you can use your SIM.