If you are having issues connecting, work through the steps in Troubleshooting iOS and WiFi. While there do seem to be a number of users having WiFi issues, it is more of an individual issue than a universal issue. The vast majority of us have no issues with iOS 6.1.2 and WiFi connectivity. Those with issues need to work through the troubleshooting steps carefully. They also need to note if this is a single WiFi network that is a problem or is it all networks. If all networks the iPhone needs to visit an Apple store genius bar for testing by the techs.