Best way to recycle/dispose of old smartphones/tablets while protecting personal information?

My dad and I both have several old Android smartphones and tablets (virtually all Samsung products) that have been piling up and we have no use for. I've held on to all of my old devices in a drawer (starting from my first phone, a Motorola flip phone) as I grew up with a hoarding mentality and had this idea that my collection of phones over the years was like a museum showing how the technology progressed over the years, …

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