Patent ID: 7634253

Claim:
A method in a wireless portable communication device for use in maintaining appropriate authentication credentials for accessing a common data application maintained in a common service network for receiving a messaging service, the wireless portable communication device having default authentication credentials for submission when establishing, via a default cellular network, data connectivity for accessing the common data application maintained in the common service network for receiving the messaging service via the default cellular network, the method comprising the acts of: in response to a change in subscription for the wireless portable communication device from the default cellular network to a current cellular network: receiving, via the current cellular network, a data session configuration file including authentication credentials for submission when establishing, via the current cellular network, data connectivity for accessing the common data application maintained in the common service network; prioritizing between the default authentication credentials and the received authentication credentials; and using the received authentication credentials corresponding to the current cellular network for submission when establishing, via the current cellular network, the data connectivity for accessing the common data application maintained in the common service network for receiving the messaging service via the current cellular network.