Make sure that your phone is Qi wireless charging compatible.
Apple began making Qi wireless charging iPhones starting with the iPhone 8. Older iPhones are not compatible, and should be charged using the USB port.
If you have an Android device, check the owner's manual to verify that it is Qi wireless compatible.
Make sure to place Qi compatible device face up on charging rest.
Reposition your phone on the wireless charging surface.
CAUTION: Remove metal protective or magnetic case from phone before charging. When charging phone, do not place magnetic-striped or other metal objects on the charger. Doing so could damage the object or this unit. Qi compatible phones with metallic looking finishes will charge normally.