Your house, your rules. If the CP sent your child with a bike to ride...you control the amount of time the child rides the bike and how far the child can go. CP can not rule the bike at your house. I think it is the same thing for the cell phone. Just because the child brings it to your house does not mean that the CP has control of the phone and when the child uses it.
Put it away until a certain time and then give it to her to call her mom. The mom may want to say..."What if it's an emergency and I need to talk to her." Uh...call the house.
Put it away until a certain time and then give it to her to call her mom. The mom may want to say..."What if it's an emergency and I need to talk to her." Uh...call the house.