When mobile phones first became relatively inexpensive many parents bought them for their teenage children on the grounds that having access to a phone would keep them safe. High profile cases of abduction at the time underscored the need to improve safety for young people. But today mobile phones invariably have access to the internet, which has made young people vulnerable to stalking and cyberbullying. Since the stated case for buying teenagers mobile phones was to keep them safe, we should now restrict their access to them.