Abstract: A system is provided that enables the delivery of multiple concurrent mobile applications to a mobile communication device. A concurrency application server interfaces to a mobile switching center to obtain call parameters in order to determine a context of a mobile device call. The concurrency application server also interfaces with equipment in a data network. A concurrency application plug-in resides on the mobile communication device to enable the device to switch between two or more active mobile applications on the device, either under user control or automatically. The concurrency application server determines a context of a call or other activity engaged by the mobile device user to determine what additional content to deliver for display on the mobile device, or what other mobile applications to invoke for the mobile device.