1. A method in a mobile communications device operable in a wireless network, the method comprising: requesting activation of a data session with a node via the wireless network; receiving a reject message via the wireless network in response to the request for activation of the data session, the reject message comprising a cause code; and if the cause code corresponds to a no-retry behavior of the data session retry mechanism of the mobile device, the mobile communications device no longer requesting activation of a data session with the node, wherein the correspondence of the cause code to the no-retry behaviour is at least partly dependent on a carrier that the device is attached to.