Wireless charging is done by your QI charger creating an invisible field of energy between your phone and the charger. A lot of variables can cause the charging to be impaired. If the QI charger or your USB power supply is below the required power level specified by your phone manufacturer, charging time will be increased and amount of material you can have between your phone and the QI charger is dramatically lowered – So when you add a cover, you also add to distance and amount of material between your phone and charger and of course when you remove the cover, added distance and material is also removed again and . So please check that you have the best possible charging capacity available and specified if you experience that your phone charges slowly or even do not charge, as this is the real issue of bad charging experience. https://support.apple.com/en-us/HT211829 Previous phones require 12W charging power – recommended USB-A 5V/2,4A charger iPhone 12/13 mini requires 15W charging power - recommended USB-C 9V/2,22A charger iPhone 12/13/14 (rest) requires 20W charging power - recommended USB-C 9V/2,56A charger So no old USB-A power supplies to make sure wireless is working 100% as it should Std. USB-A = 5V with 2,4A delivers 12W Std. USB-C = 9V with 2.22A delivers 19,98W Power USB-C = 9V with 2.56A delivers 23,04W