Some old mobile phones have switched position of green/red buttons.
Currently the green button is at the left and red button is at the right side on mobile phones.
Why? That is rationale? Which standard covers this behavior?
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Answer
Older mobile phones were expected to be used with one hand at least some of the time, and given that most people are right handed, the right position for the answer button was positioned the best for your right thumb to press it.
In more modern phones, people are expected to hold them in one hand and press the button with another (think smartphones). In this case you'd want to present someone with the default action first, and reading from left to right, that would be the left most button.
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