Compared to a standard wall outlet, charging your phone via USB needs a USB power adapter. However,  wall outlets with USB charging ports charge your devices directly, through a USB cable, and good charging outlets come with two ports.

The best USB  harging wall outlet: Topgreener TU21548A Smart Dual USB Charger Outlet (two USB ports, great power output)

The best USB charging wall outlet with USB-C: Topgreener TU21548AC Ultra High Speed Smart USB Wall Charger (with a  5-volt/3-amp USB-C port )