Display Phone on a Roku TV

Go to settings on your Roku TV & system, then select Screen Mirroring. For iPhone, go to Apple AirPlay and HomeKit. Check these settings only if your TV doesn't appear to Cast on your phone. But you can automatically connect, without checking settings on your tv. On your Android phone, click Screen Cast or on your iPhone click Air Play. On your Android phone Please wait at least 2 minutes for it to load. And now you should see a message on your Roku TV, requesting that you click allow.
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