The invention relates to a mobile communication method and a device capable of receiving an incoming telegram in a powering off-charging mode. Under the powering off-charging mode, a mobile communication device can provide a first electric power to keep a basic communication with a base station. After the base station receives an incoming telegram notice, the mobile communication device provides corresponding incoming telegram information and judges whether the mobile communication device leaves the powering off-charging mode or not. After leaving the powering off-charging mode, the mobile communication device provides a second electric power to keep an integrated communication with the base station, wherein the first electric power is lower than the second electric power. Incapable of influencing the whole charge efficiency, the mobile communication method and the device capable of receiving the incoming telegram in the powering off-charging mode can monitor incoming telegram at any time during a powering off-charging period so as to enable users to answer important incoming telegrams timely.