Staying true to the muddied mess that is mobile computing, the smartphone has probably seen the most volatility in design over the years. Personal digital assistants and cell phones were a natural merger back in the day, favoring the PDA form with the addition of voice capabilities. Since then, the general form factor has remained the same, though things like hard-button keyboards are nearly a thing of the past, opting instead for “slab of screen” designs with few physical buttons in favor of on-screen controls.
Adding more confusion to the mix are devices like the Lumia 950 and 950XL with Windows 10 Mobile, which can present a desktop-like experience when connected to peripherals and external displays.
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