A new study of UK parents reveals kids’ unauthorised app purchases have added £30 million to their smartphone and tablet bills.

According to the research carried out by Windows Phone more than 25% of UK parents are affected by their children’s app behaviour with 34% of parents now hiding their devices away from their children.

Shockingly, 83% of these parents have suffer an increased monthly bill with one in ten saying that they were worried they wouldn’t be able to pay. Whether these purchases were accidental or another in a line of evil-children-robbing-noble-parents stories is beside the point, handset makers and operating systems should sort this out.

Microsoft is the company that conducted the research and says the Windows Phone 8 o/s has a Kid’s Corner feature where in-app purchases are prohibited, something that says that no other smartphone has. If that is so then others will surely follow.

Now I’d better check my bill and see what my ten-year-old has been doing…

* These stats based on research carried out among 2,000 UK parents who own a smartphone or tablet by OnePoll, 8-11 March 2013