Discuss it with H. Make a joint decision. If you both disagree about the phone, let H make the final decision.
Thank you for the advice. I did not let her take her phone because her grades have not improved.
I'm rather mad right now because H did not share the important emails regarding DD trip and I did not have an important form that needed to turned in. Luckily I was able to text the information to the leader. I was embarrassed because the leader asked if we had gotten his emails regarding the trip and I said that I did not, maybe H had but not me. I swear H spends more time telling the OW about "everyday things" that he forgets who he tells!