1. A method for implementing a wireless network service policy on a wireless end-user device, the method comprising: obtaining, from a user interface (UI) or a wireless network interface of the device, a quality of service (QoS) activity map, the QoS activity map indicating a respective QoS policy applicable to each of plurality of wireless network service usage activities, wherein the QoS policy indicated as applicable to a particular wirless network service usage activity is based on a device application associated with the wireless network service usage activity and at least one other policy criterion applicable at the time of the wireless network service usage activity; identifying, for a given wireless network service usage activity, the device application associated with the given wireless network service usage activity; determining an applicable QoS policy for the given wireless network service usage activity from the QoS activity map, based on the identified device applicaton and the at least one other policy criterion; and applying the applicable QoS policy from the QoS activity map to the given wireless network service usage activity.