Thanks for reaching out to the Roku Community.
We're here to help. To connect your phone to your Roku TV, you will need to use the Roku mobile app. This app is available for both iOS and Android devices and can be downloaded for free from the App Store or Google Play Store.
Once you have downloaded the app, make sure your phone is connected to the same Wi-Fi network as your Roku TV. Then, launch the Roku mobile app and follow the on-screen instructions to connect your phone to your TV.
For a more detailed step-by-step guide on how to connect your phone to your Roku TV, please refer to our support page at the following link: How to connect the Roku® mobile app to your Roku device over Wi-Fi
If you have any further questions or issues, please don't hesitate to reach out to us for assistance.