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Four leading web providers are to offer customers the option to block adult content at the point of subscription.
BT, Sky, TalkTalk and Virgin will offer the protection for smartphones, laptops and PCs.
The prime minister will also launch Parentport - a website to help parents complain about inappropriate content.
The big four ISPs said in a statement that they: "have worked closely with Government and a range of stakeholders to swiftly introduce measures addressing recommendations set out in the Bailey Report."