In vs. On: What’s the Difference? - Udemy Blog
https://blog.udemy.com/in-vs-on/
You can sit on the chair. You might also use “on” when referring to a device or machine. When someone is “on the phone,” for example, this indicates a person is using the phone. Although this is an idiomatic phrase that makes little sense when taken literally, “on” is the correct preposition in this instance.
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