A father in Singapore is suing his son's school principal for confiscating his mobile phone for 3 months. The school has a ban on using mobile phones during school hours, punishable by a 3 month confiscation. However, the phone belonged to the father, who had lent it to his son that day, and the school refused to return it to the father. Do you think the school should return the phone to the father or keep it for the 3 month period?