Systems and methods for providing carrier-centric data communications cost monitoring and controls are provided. In an embodiment, the method operates by receiving a registration request associated with a subscriber session, determining current data usage associated with the subscriber, and receiving data usage thresholds. The method further comprises receiving quotas associated with the subscriber session and collecting data usage information associated with the subscriber session. The method sends a notification to the subscriber when a pre-determined quota is exceeded during the subscriber session and controls data usage. The cost monitoring and control system comprises a usage policy server and a usage policy application. The usage policy application allows a carrier to offer alterations to terms of a subscription. The usage policy application displays current data usage information on a per-network and per-application basis using subscriber profile information, subscriber session information, and prior subscriber usage history provided by the usage policy server.