Why do I need a personal hotspot to connect my HDMI cable to my TV?

I

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Iphone hdmi cable

I have an iphone on pay as you go and i got a hdmi cable to connect it to my tv but it wont work because it keeps telling me to activate my personal hotspot witch my phone does not have. My question is why do i need personal hotspot for it to work why cant it just work threw wi-fi. I feel ive wasted money on the cable it seems like a con for me to use my mobile data.
 

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