Apple announced the release of iOS 18 at the Worldwide Developers Conference, introducing features like a redesigned home screen, customizable control center, and a new password manager app. While the general public release is later this year, you can download the developer beta now for free if you have an Apple ID. However, be aware that the beta may contain bugs that could impact the performance of your phone. If you have a backup iPhone, it's recommended to use that for the beta testing. To enroll in the free Apple Developer program, sign in with your Apple ID and agree to the terms. You can then install the iOS 18 developer beta over-the-air on your iPhone or through your Mac. Remember to back up your phone before updating in case you want to revert to iOS 17. Overall, while exciting, downloading the iOS 18 developer beta should be approached with caution.