How can one minimize the personal exposure to high-frequency electromagnetic fields while using a mobile device?

High-frequency electromagnetic fields that are generated while using a mobile device (phone, smart phone or tablet) are in general stronger than those one is exposed to by a neighbouring mobile phone base station. Therefore it is useful from a precautional point of view to keep the strength of the fields the user of these devices is exposed to as low as possible. The Federal Office for Radiation Protection is providing tips for using your mobile phone and for using smart phones and tablets.