Abstract: A method for delivering data to a mobile device can begin with determination of the need to transmit data to a client application installed upon a mobile device by a provider in response to the occurrence of a predefined event. A session initiation protocol (SIP) message encapsulating the data can then be addressed to the mobile device using a static, unique identifier of the mobile device. The static, unique identifier can be acquired during registration of the mobile device for the service and can be electronically coupled with a hardware component of the mobile device. The SIP message can be conveyed to the Internet protocol (IP) multimedia subsystem (IMS) of an IP-based mobile communications network via a dedicated communications mechanism where it can be routed based on the static, unique identifier.