Abstract: A mobile handset configured to estimate the radiation absorbed per mass of tissue of a user, and to perform an action in case the absorbed radiation exceeds a predefined threshold. The absorbed radiation may be estimated during a call. Additionally or alternatively, a prediction of the absorbed radiation level may be estimated and given to the user while the handset is not engaged in a call. various data items such as received power per time, estimated absorbed radiation and location may be transmitted to a server. A server application may use these data items to create regional maps of a cellular network coverage and quality by accumulating multiple inputs from a plurality of individual mobile handsets.