Apple today released iOS 7.0.6, which fixes an SSL related bug. SSL is what your computers and phones use to create a secure connection with many servers such as web servers and email servers.
To install the update connect to WiFi then go to the Settings app > General > Software Update.
Rumors are pretty strong that Apple will be releasing iOS 7.1 in the next couple of weeks. The upcoming update will tweak many aspects of the new iOS 7 interface, such as changing some colors and buttons and adding more accessibility options to make the screen easier to read.