If your iPhone 5 and iPad mini have Wi-Fi issues, then you can resolve it with the newly released iOS 6.0.2 update of Apple. But it may reduce the battery life of your device. If you have such battery problems with iOS 6.0.2, you can share them to a thread that created by some users on the official support forums of Apple.
The iOS 6.0.2 update is released to fix the Wi-Fi bugs for the iPad mini and iPhone 5. The users commented that, the update was introduced the Wi-Fi connectivity issues for them during the release.
The users are feeling the battery problem on their iPhone 5. But with the iPad mini, there was no mention of iOS 6.0.2 battery problems.