1. A method performed by a network system, the method comprising: obtaining, from a device-group management entity, at least a portion of a device-group service policy applicable to a device group managed at least in part by the device-group management entity, the device-group management entity being different from a network system operator associated with the network system, the device group including a plurality of end-user devices communicatively coupled or capable of being communicatively coupled to the network system over a wireless network, the plurality of end-user devices including a first end-user device and a second end-user device, the device-group service policy to be applied when any end-user device in the device group communicates or initiates communication over the wireless network, the device-group service policy comprising: a classification policy to assist in identifying traffic associated with one or more available service activities, the one or more available service activities being a subset of all service activities available over the wireless network, the traffic associated with the one or more available service activities consisting of data traffic, and a control policy to assist in controlling at least a portion of the traffic associated with the one or more available service activities; identifying prospective, attempted, or successful data traffic over the wireless network associated with the first end-user device; based on at least a portion of the classification policy, identifying first traffic associated with the one or more available service activities within the prospective, attempted, or successful data traffic over the wireless network associated with the first end-user device; and based on at least a portion of the control policy, controlling at least a portion of the first traffic associated with the one or more available service activities.