Remote working can involve many hazards, particularly when it involves heavy equipment.  In forestry, for example, chainsaws are often used, and even the most diligent worker can have a serious accident.  In such a situation you can’t take the risk that a cellular signal is not available at ground level.  One innovative approach to this situation is to have a cellular drone that can be launched from a support vehicle to ascend to a height where a roaming SIM can reach a carrier to transmit the emergency call.