A router system receives from a host service a message which is intended for delivery to a mobile device via a wireless network. The message includes at least a first field having an identifier which identifies the mobile device, a second field having a payload of the message, and a third field having a return packet indication on whether to return a return packet to the host service. The router system examines the indication in the message and, if the indication is set to a first setting, the router system returns to the host service a return packet which indicates a status associated with the message for delivery to the mobile device. If the indication is set to a second setting, then the router system does not return to the host service the return packet which indicates the status associated with the message for delivery to the mobile device.