A:AnswerYes you can! The charger can absolutely be used while having a phone case one, be warned that using a generic phone case while it’s charging will make it harder for the magnet to attach to the phone. It would be best to purchase the specific IPhone Maglock phone case so it can attach easier and make the charger to the phone more powerful.
A:AnswerIt will charge your AirPods 4 but they won't stick to it with magnets. You will need to set it flat and put them on top for it to charge. The AirPods 4 case is too small to include the MagSafe magnets.