They tried a handheld UI, with Windows phone but it failed. I think mostly because their UI was too far from what people expected aka something looking like ios (Android UI is almost a copy of iOS UI) and also because they came into the market too late with too few product innovations to be appealing. With 5% of market shared, this was not worth the cost, for devs on the plateform. If they want a comeback in the smartphone industry, maybe they have something to play with copilot and AI. Like an Android with free AI agents out of the box.