I've got some old cords that have a micro-usb port on one end and a wall plug on the other. These are for charging mobile phones I used to have. Should I toss them or save them for future phones I ...

Any Micro-USB cable worth its salt—even Micro-USB–to–USB-C cables—can carry up to 15 W of charging power (although most tap out around 12 W) and transfer data at sluggish USB 2.0 speeds ...