Why do they call it a mobile phone, when if you leave it on the table and go to...

Because it can be moved and transported whereas a landline is stationary.
 
You're sort of an idiot, aren't you? Either you mean this question, which makes you an idiot, or you are trolling, which still makes you an idiot.

This question isn't clever.

Hmm... what would be the major difference between a land-line and a mobile phone?

How could I make this a funny question? If the mobile phone stays still, is it still mobile? Uhm... nope that's not funny... try again.
 
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