Apple seeded iOS 6.1 beta 4 to developers and now has released iOS 6.0.2 firmware for iPhone 5 and iPad Mini which “fixes a bug that could impact Wi-Fi.”
iOS 6.0.2 Software Update
This update contains improvements and bug fixes, including:
Fixes a bug that could impact Wi-Fi
For information on the security content of this update, please visit this website: http://support.apple.com/kb/HT1222
The firmware update is only for iPhone 5 and iPad Mini. You can update your device by going to Settings >> General tab >> Software update.
You can also download iOS 6.0.2 by going through the direct download links mentioned below-
Musclenerd of iPhone dev team has tweeted that jailbreakers should avoid updating to iOS 6.0.2.