Screen mirroring that uses wireless display technology like Miracast actually creates a direct wireless connection between the sending device and the receiving device. Therefore, no Wi-Fi or internet connection is required to mirror your phone screen onto your smart TV.
How do I set up screen mirroring without WiFi?
https://www.youtube.com/watch?v=hudOrgUC9Eo
Can I screen mirror using mobile data?
It doesn't take any data because in order to use screen mirroring, you will need to use a WiFi network to do that (unless you use mobile hotspot from your smartphone but that's not really recommended and may cause lag from a weak connection unless you have reliable 5G internet)..
How do I screen mirror without Wi-Fi?
Screen Mirroring Without Wi-Fi Therefore, no Wi-Fi or internet connection is required to mirror your phone screen onto your smart TV. (Miracast only supports Android, not Apple devices.) Using an HDMI cable can achieve similar results.