2- Use your mobile device in good reception conditions. In fact, your terminal automatically adjusts its transmission power according to the radio signals it receives from your network operator. Reception is good when the display screen shows 4-5 bars. This is not always the case in certain areas or situations, particularly underground parking, lifts, in cars or trains, or just in an area poorly covered by the network, far away from mobile base station.
Moreover, using your mobile in good reception conditions will extend the autonomy of its battery.