The MagBank is compatible with almost every phone that supports wireless charging. For iPhone 12's, MagBank will magnetically attach without a problem. For all other phones, apply the included adhesive magnetic ring to the back of your phone, with or without a case.
MagBank works with most cases! If your case is flat and is made of a hard material, the included magnetic ring should stick just fine, thought it may have issues sticking if your case has ridges or lots of texture.