Brian X. Chen from The New York Times reports that many parents bought smartphones as holiday gifts for their children. In light of the recent revelation in a Colorado high school of the widespread use of vault apps (phone apps with sexting capabilities that disguise themselves as calculators or other tools) and the fact that many parents complaining of exorbitant charges on their cards by in-app purchases or video streaming, he investigated and tested the parental controls of Apple’s iPhone and Google’s Android operating systems. His testing resulted that Apple’s parental controls are thorough and parents who want tight control over their children’s activities on smartphones will be better off buying iPhones for the family. The Android system, on the other hand, could only accomplish a few family-related tasks.