Yes, a laptop is a mobile device. In addition to the mobility of the computer itself, many laptops connect wirelessly with other devices from their location, making them virtually available from any distance. Mobile devices are classified based on how they're used and what types of networks they use. So if it's primarily used while seated in one place and can't move around outside home or office without being physically removed from a network, then it may not be considered "mobile". But laptops rely both on their own physical mobility as well as network connectivity to be mobile for all practical purposes...