Don't get rid of your old smartphone. Learn how to repurpose old phones to keep using them for years after you've gotten a new one.

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However Samsung kept whittling it down even stripping the slot from the A5,3 series of devices leaving the slot on the A16.

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Abstract: The paper discussed recent progresses of hafnium oxide-based ferroelectric materials, devices and chip technologies which improves the performance, reliability and energy efficiency, ...