An Ethernet frame nester nests Ethernet frames addressed to a plurality of remote station devices affiliated with a shared station device on the basis of the correspondence relation between a MAC address of the station device and MAC addresses of the remote station devices stored in a table and the transmission destination addresses of the Ethernet frames. The message service application is configured to present partially completed message service messages on a display of the portable electronic device to a user. The method contemplates various criteria for determining when to alter the radio block, which include: whether an unacknowledged radio link control mode is used and whether a robust coding scheme is used.