or use cordless phone. My kid did some literature search for his school project and came across this: http://www.safeinschool.org/2012/01/ipad-iphone-wi-fi-radiation-and.html
The website has some interesting links to external sites like this: http://betweenrockandhardplace.wordpress...cked-my-health/
iPad iPhone Laptop Wi-Fi DECT Cordless Phone Radiation and Magnetic Fields Please feel free to share the following videos with your friends who own iPhone, iPad, iPod Touch and other smart phones and tablets - especially parents who let their children operate these devices. A lot of people think that if the devices are not "connected" to Wi-Fi and are just on standby mode, there will be no radiation. The measurements showed that this is not true. The emission of microwave signals was continual and the levels were high.
Nokia’s former Technology Chief, Matti Niemelä, was involved in the development the world’s first mobile phones, but fell seriously ill himself from mobile-phone microwave radiation. [...] Niemelä explains that the subject of mobile phone radiation has always been kept silent at Nokia. – You couldn’t talk about it within the company. Yet, among the staff, it was speculated whether the radiation could cause damage. However, no one dared to bring it up, because it could get them fired.