Do you want to play games in/on my phone/PC? 'in' vs 'on'

[Twilit1988]

My dear and respected teachers,

1: "What's the English for...?" OR "What's the English of...?"

2: "I always use Yahoo! in my phone." OR "I always use Yahoo! on my phone." Which one is correct?

3: "Do you want to play games in my phone/PC?" OR "Do you want to play games on my phone/PC?"

4: "Today he went to get my child admission to school." correct?

[Mister Micawber]

1: "What's the English for...?"

2:"I always use Yahoo! on my phone."

3: "Do you want to play games on my phone/PC?"

4: "Today he went to get my child admitted to school."
.
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Native English teacher at Mister Micawber's