Any new options for casting from a mobile device to a TV?

Well if you want wireless you have two or 3 options Blue Tooth and Wi-Fi. are the wireless ones. #3 is Wired.

Now... If you are good with Linux a Raspberry PI might work Some of them support either BT or a BT dongle (2 3 4 all support dongles as I recall) There are some other options too.

I just spent (by the time it's fully set up about 200 dollars but 150) on a Vio or vivostick Windows 10 "machine" this puppy plugs into the HDMI port on the TV and eats USB power it's a full featured windows 10 running on an Intel Atom. about 3/4 inch by 1/2 inch by 5 inches 32 meg SSD. Tomorrow I'm putting it in full service but it set up and loaded the programs I want.

IT supports both Blue Tooth and Wi-Fi

Not sure how well you can stream to it though.

But if you want to do it wireless you have limited options

I used to know a man who made a micro tv station (Composit in UHF out analog) but well.. That was a long long time ago and I'm not sure they were type accepted.

What make and model of mobile device and TV do you have?

MoFi

Do the HDMI connector. I don't know of a phone plan that had unlimited hotspot data, and you will use way more than you think. I've been using the Apple HDMI adapter for the last 6 weeks, and it's generally worked pretty well.

I have seen a MoFi 4500 4G LTE router advertised that is suppose to use the SIM card from a phone, so you're getting the unlimited data plan of a phone run thru a router.m It seems to have good reviews on Amazon.

The most up-to-date I'm aware of is a smart tv.

If you have a phone with a hotspot then you can use Hulu to do it. I'm no expert but I have an offer from them that came with my TOGO