If you can turn on your phone wifi,lte and hotspot at the same time you can connect to Chromecast without external wifi router or a second phone as hotspot ,only 1 phone
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![How to Use Chromecast Without WiFi 2023 [Mobile Internet Hack]](https://www.cloudwards.net/wp-content/uploads/2021/11/google-home-app-step-1.png "How to Use Chromecast Without WiFi 2023 [Mobile Internet Hack]")