Hi. My daughter has an iPhone 5 on 8.0.2 that she uses at school to contact my wife and I. She mostly texts us, but has on rare occasion needed to call us. She has been getting phone calls while at school from telemarketers as well as other various numbers. Is there any way to change the phone's settings so only calls from those on her contact list (me, my wife, my parents, my brother (her emergency contact) and sister) will be received?