Capability update during call

A method, comprising:

• providing a first mobile device on a first network and a second mobile device on a second network, wherein the first network supports Circuit Switched (CS) and Packet Switched (PS) data, and the second network supports only CS;
• setting up a call between the first mobile device and the second mobile device through configuration of a communications link that allows the first mobile device and the second mobile device to exchange CS data;
• providing a capability update message from the second device to the first device, during the call, in response to a hand over of the second mobile device to a network that supports CS data and PS data, wherein the capability update message indicates to the first mobile device that the second mobile device is on a network capable of supporting both CS data and PS data;
• reconfiguring, during the call, by the first and second mobile devices after providing the capability update message to the first mobile device, the communications link to allow the first mobile device and the second mobile device to exchange concurrently both CS data and PS data, wherein reconfiguring after providing the capability update message includes registering the first and second mobile devices for PS services.