There Are iOS 9.0.1 Problems
You should know that there are iOS 9.0.1 problems plaguing iPhone 6s users. iOS updates are never perfect so this doesn't come as much of a surprise.
While there are some widespread iOS 9.0.1 problems, most of the problems we've seen are isolated. iPhone 6s users are complaining about battery drain, connectivity issues, problems with lag, and more. These are all common immediately after an iOS release.
This is precisely why we tell people to prepare ahead of an iOS install. You never know how a small update like iOS 9.0.1 will impact your device.
This article may contain affiliate links. Click here for more details.