If you are considering inserting a metal plate on the back of your phone while using our cases, it would very much depend on the thickness and size of the metal plate itself.
As some of these metal plates could be too thick, causing fitting issues with our cases. Furthermore, there are cases in which these metal plates could cause interference or issues with wireless charging and phone signals.
Generally, we would never recommend anyone to do this as the metal plate could potentially scratch the back glass or aluminum texture of your actual phone!
Note as well that for more recent iPhones, we offer case versions compatible with MagSafe!