Connect your iPhone 15 or smartphone from Samsung or other brands to a USB-A charger with a USB-A to USB-C cable. Mostly older chargers have a rectangular USB-A port. The other end of the cable is USB-C. Note: the iPhone 15 has a USB-C, but all older iPhone models have a Lightning port. This differs per iPad model, so make sure you check that before you buy a cable. Smartphones and tablets from other brands have a USB-C port. Nylon and kevlar cables last longer than plastic cables. With a long cable, you have extra freedom of movement while you charge.