How can I watch films from my mobile phone on my smart tv WITHOUT using my data volume? (I don't have a fixed internet)?

Following problem:

Would like to connect my huawei p20 pro to my smart tech 40 inch smart tv.

Preferably wirelessly, otherwise also via cable. Not really matter.

My only problem at the moment is that I don't have a permanent internet connection, at the moment I can only access the net via my mobile phone. To be precise, 6.5gb per month. Not much.

Is there a way to somehow watch the films U videis which I have on my mobile phone on my TV? But WITHOUT using my rare data volume for this?

A precise explanation for this approach would be great.

For info: I only have the option to go online via my 6.5gb monthly lte data volume. No fixed internet.

Is there a way to watch my films, which are on my mobile phone (not SD memory card), on my smart tv without burdening the limited monthly volume. Do I have to order a USB c to hdmi adapter, for example. I only have a USB c charging cable from Huawei.

Streaming actually always works via Wi-Fi. Your data volume doesn't bring you anything here either.

A WLAN network without internet should be enough.

Open the WLAN hospot via the mobile phone and register the TV on it

Of course, this uses up the data volume, unless you have a Red contract with vodafone, there are so-called "passes" for such things, so no data volume is charged for YT, for example

@rolajamo. How can I set up such a Wi-Fi network? I only have my p20 and a smart tv. Possible with it?

Buy a cheap router with Wi-Fi and use it to connect the television to your mobile phone, starting at 20 euro
https://www.kaufland.de/product/306449915