I stumbled into this because I volunteer at three food shelves around Burlington, Vermont doing food distribution. At the largest one there is a day shelter with outreach workers and a kitchen serving hot meals. I gave a few phones to the outreach workers that I got from family members, and found that there was high demand so I just started posting on community forums asking people for their old phones. In a few cases I have replaced batteries or screens but if the phone is usable I distribute it as-is after erasing it and applying any software updates. I buy cables and chargers in bulk so I can deliver a complete kit. Almost all the work is sitting down with the donor and erasing it.