it’s not for you.如何理解You can also do this when you order food at a fast-food restaurant or when you answer the telephone and it’s not for you.

it’s not for you.如何理解
You can also do this when you order food at a fast-food restaurant or when you answer the telephone and it’s not for you.

介系词for表示为,给的意思,所以“It's not for you”表示“这不是给你的”,这里表示“这不是打给你的电话”.希望我能帮助你解疑释惑.