iOS 13.3 was released on December 10, 2019. This is not a huge upgrade as iOS 13.2 was, but there are some new features added and a huge list of bug fixes done in core apps, settings, etc. You can view the available version updates at Settings > General > Software Update. This is for all iOS 13-compatible devices. This means the iPhone 6S and newer and the current iPod touch 7th generation. Below is the list of top 3 features added in iOS 13.3 version.