The popular evangelical author Philip Yancey, 69, has claimed...
Advice comes after Office of Fair Trading launches investigation to see if manufacturers are unfairly encouraging the purchase of items such as upgraded membership, or virtual currency.
The Office of Fair Trading's begun an investigation into free mobile phone apps which could end up costing children and parents a fortune.
That's the concern after cases when youngsters have been playing a free download.
But are then hit with extra charges for in-app purchases.
Matt Buttery is the Chief Executive of Family Matters Institute.
He told Premier's News Hour parents need to use their common sense:
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