What is the proper way to handle a gold-plated phone after purchasing it despite knowing its prohibition? Is it permissible to sell it or dispose of it in a manner that pleases God?

It is not permissible for men and women to use a gold-plated phone. If you use it knowing it is forbidden, you have committed a sin and must repent. There is a disagreement among scholars about the permissibility of possessing it without using or selling it. The preferred opinion is that its sale is not permissible, and the way to dispose of it is by removing the gold from it; then it is permissible to sell the gold alone and sell or use the phone.