Why punish your Daughter by taking her phone you got her, the mom is just bugging you, don't let it. I'm sure your girl likes having 2 phones to carry...phones are cool to them. Let your daughter use her phone from mom to call her mom and friends and the worldprepaid for you and your side of family to contact her. Child support is child support, it doesn't mix with any other aspect. Paretning plan does, but don't get wild over this one, it's the really big stuff you need to worry about. You know the home phone number and and can email to contact her even if there wasn't cell phones. But you can always be in contact with your girl with the prepaid.