First, make sure both your device and your TV meet the requirements for using Chromecast, then follow the instructions below:
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Make sure the phone or tablet is connected to the same Wi-Fi network as your Chromecast.
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Open discovery+ and choose the Google Cast button
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Choose the device that you want to cast to.
To stop casting, choose the Cast button again and then Disconnect.
Troubleshooting
If Chromecast isn't working on your device, here are some things to try:
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Update your device to the latest OS version.
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Try restarting your Wi-Fi and reconnecting your devices.
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(iOS only) On your iPhone or iPad, go to Settings, then scroll down and select discovery+. Make sure Bluetooth and Local Network are both turned on. Close discovery+ and reopen the app.
Need help? Go to Google's Chromecast support article.