Tell me please which one of the following sentences is correct.
I can only watch it on Wi-Fi.
I can only watch it by Wi-Fi.
I can only watch it through Wi-Fi.
I can only watch it via Wi-Fi.
Tell me please which one of the following sentences is correct.
I can only watch it on Wi-Fi.
I can only watch it by Wi-Fi.
I can only watch it through Wi-Fi.
I can only watch it via Wi-Fi.
I would say that "I can only watch it by Wi-Fi." isn't normal usage, but the other three are all fine.
Since I work in IT, the first one grates a little, and 'via' is better, but for everday usage the reverse is probably true.