This is quite a good list of ways to reduce your exposure.
Source: https://mobileradiation.com/how-to-protect-yourself#reducing-your-exposure
People are advised to reduce radiation exposure whenever possible. There’s no need to drastically change your lifestyle, just adopting new habits is enough to feel safer.
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Cordless phones should be used close to their base and you could consider connecting to the Internet using an Ethernet cable instead of a wireless router. Laptops should not be placed on your lap while working; especially if you are a man because of the impact radiation might have on fertility. It is important to use laptop pads. Smartphones should also be used with caution.
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Use a headset or a speaker phone mode for calls. Holding a phone to your ear increases radiation exposure and is against the terms of service information that comes with a phone.
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Avoid calls when the network signal is weak, this is when mobile phone radiation is strongest.
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Do not carry your mobile phone close to your body. Men should not keep their smartphones in their front pockets. Women should not keep their smartphones in their bras.
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Set your mobile phone to airplane mode when it is time to go to sleep. Studies show that blue light, notifications, mobile phone radiation and other electromagnetic field (EMF) exposures at night can interrupt sleep cycles and contribute to a host of ailments such heart palpitations, muscle pain and weakness, and daytime irritability.
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Avoid using your mobile phone in basements, underground stations, elevators, etc. Check the conditions of optimum signal reception, usually outdoors or near a window while inside.
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Try not to use your mobile phone in a car. The electromagnetic radiation from mobile phones is amplified by the metallic structure of a car.
Put your phone away if you don’t need it close to you at all times. This is useful not only due to radiation but also to avoid general distractions.