What if children visit harmful websites?

The popularity of smart phones and the improvement of people's living standards have led many parents to buy smartphones for their children. Children right from wrong ability is poor, vulnerable to a variety of complex information on the Internet, they used their mobile phones the harmful website, this is very bad for their healthy growth, in this case, you can use a gsm 3g 4g jammer to its mobile phone signal shielding, indirect banning them from cell phone use the harmful website.
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