Source: https://bsky.app/profile/funnysnarkyjoke.bsky.social/post/3lmkfwebeuc27
In fact you can use your smartphone to change the channel on nearly any TV. In the comments on that post some people talk about how to do it. Basically you need a smartphone with either builtin IR or use a USB-C IR blaster or if your phone has a 3.5mm headphone jack you can also try one of those but I’m not sure if the 3.5mm ones are as commonly supported.
I read about the Flipper Zero and it seems really awesome! I even saw some high power LEDs for it that could in theory change the channel from a long distance.