Different menu when on smartphone

Hello, is it possible to use a different menu (for example "mobile menu" instead of "main menu"), when people view a website on their smartphone? And if it is, how do I do this?

I’m afraid that modifications such as this require extensive changes to the theme’s code; I do apologize but such large changes are custom work that are beyond the scope of our technical support.

I always thought that was what the "mobile menu" was for.

Hi

This menu is from a time when responsive designs were not a standard yet. Than there were a different template for a mobile devices and selecting of a different menu was possible.