Children as young as three to seven years old have their own mobile devices or use their parent’s devices, but a study has found that many children up to 15 years of age don’t understand online safety and how to stay safe using the Internet.

Children are inclined to hide negative online experiences from their parents or other adults, according to a newly published report which also reveals that one in three Australian children have been harmed by cybercrime, including suffering bullying online.

Apple has suffered a massive legal defeat in the US, being forced to refund US$32.5 million ($36.5 million) to American parents whose children racked up huge bills from in-app purchases.