All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah and that Muhammad is His slave and Messenger.
You did not mention the reason why you prevented that boy from keeping that phone in your home. There is no doubt that you are not obliged to allow him to keep it, but we recommend that you be wise while taking into account what is more beneficial regarding the matter of preventing him from keeping that phone in your home or not preventing it.
You should endeavor to maintain the relationship between you and your wife in the best manner, and both of you should have an understanding in order to maintain the stability of your marriage.
Allaah knows best.