A communications network (10) advantageously provides wireless telephony service to a mobile terminal user (16) from one of a first radio access mechanism (18, 20) of a wireless telephony network (12) and a second radio access mechanism (30, 32) of a wireless Local Area Network (14). The first radio access mechanism provides service at a first quality of service (QoS) level specified in a primary Packet Data Protocol (PDP) context established with the mobile terminal user during which the mobile terminal user is assigned an address for data communication. When the mobile terminal user transitions from the first access node to the second access node, the user receives service in accordance with a secondary PDP context activated by the mobile terminal user. The secondary PDP context specifies the same data address as the primary PDP context but a different QoS level.