How to subtitute for android device's [Back] button, [Menu] button?

Unity Engine
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1

So most android phone has [Back], [Home], [Menu] hardware keys.

But iphone has only [Home] key, right?

Then how subtitute for Back, Menu keys at iphone?

And so Keycode.menu, Keycode.esc also does not work on iphone?

Thanks.

2

You need extra GUI buttons and/or gestures for that.