Thanks for your question. I am happy to report that you can always reinstall Covenant Eyes on your iPhone if you have an active Covenant Eyes account. You will want to open the App Store on your phone and search for 'Covenant Eyes'. From there you will be able to download and install the app and sign in with your username and password. In case you would like some more in depth step by step instructions I will include an article that walks you through the install and setup process here4.
Thank you and have a great rest of your day.