Tinker wrote:
He told me that he will stop by and pick them up but I told him that I would not give them to him because I know that he will give them back to them on the weekend. My daughter has been caught texting and driving, even texting my oldest son and when his girlfriend texted back telling her not to reply and stop texting she would not. She just does not understand how dangerous some of these things can be. Maybe I am a nervous nellie.lol
In Flip's utopia, both of you would agree to support the other's decisions, and that's what you should work toward with him.  However, just as he has no right to demand you give the devices back when the kids are at your house, you have no right to demand that he not when they're at his.  If you bought your daughter a cashmere sweater and your husband took it away from her, would it be ok with you if he held onto it until he decided she was ready for it?  No.  Give him back the stuff he paid for, and ask him to support you on the kids being grounded from them, even if you're sure he won't.  Until a judge says otherwise, he has just as much right to parent these kids as you do, even if it looks like bad parenting to you.  

I highly recommend you get some counseling.  I have a feeling this is going to be a rough ride.

Arrogant idiots are my favorite.