The Prime Minister has backed proposals in a report on the commercialisation and sexualisation of children that call for ISPs and mobile phone companies to "block adult and age-restricted material from the internet".

Chief executive of the Mothers' Union, Reg Bailey, has spent six months carrying out a review, which was commissioned by the Department of Education, and has resulted in the publication of the Letting Children Be Children: the Report of an Independent Review of the Commercialisation and Sexualisation of Childhood report.

As well as the recommendations on blocking in appropriate content, the report also calls for consumers to "make a decision at the point of purchase over whether they want adult content on their home internet, laptops or smart phones, rather than receiving it automatically".

"The internet industry must act decisively to develop and introduce effective parental controls, with Government regulation if voluntary action is not forthcoming within a reasonable timescale," the report added.

Prime Minister David Cameron said he welcomed the recommendations to "ensure children are protected when they watch television, are on the internet or use their mobile phones by 'making it easier for parents to block adult and age-restricted material' across all media," he said in a letter to Bailey.

"We need to make sure we hold businesses and regulators to account in a transparent way."

Cameron asked Bailey to attend a review in October, which will also include advertisers, broadcasters, video games manufacturers and internet and phone companies.

"We can use this opportunity to ask them to report to us the steps they have taken to address the issues you raise in your report and act on your specific recommendations," he said.