Hi, This is a very broad question to seek an exact answer to. All three words can be used in many different ways. For example, the definition of 'on' in my dictionary takes almost half a page The best thing is for you to try to write some sentences, and then post them for our comments.
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Anonymous Hi!On the phone, on the line.
I would like to know if I'll be using over or on in this sentence...
Since, I have you (over on) the phone.... or
Since, I have you (over on) the line.....
thanks!