The universal Adaptor can be removed from your phone or case with the application of heat, usually from a hair dryer. Be careful not to damage the device or case with excess heat. Once heat has been applied try to peal the adaptor from the device starting at one edge and working outwards. The original Universal Adaptor (Square design) can be removed by connecting it to a mount and using the mount to leverage the adaptor off your phone/case.
The 3M tape should not leave any residue. As the 3M tape is a single use adhesive and cannot be reused once removed.
We recommend sticking the Universal Adaptor to a case and not directly to your device as you could damage your device when trying to remove it from your phone.