Apparatus, and an associated method, for facilitating communication of text data, such as TTY data formed at a mobile node. The mobile node includes a TTY text generator together with mobile station circuitry, operable in a cellular radio communication system. The mobile node provides for CTM (Cellular Text Mode) modulation of the text data. If a connection is formable with the network part of the cellular communication system by which to communicate CTM-modulated data, the text data is sent as CTM-modulated. If such a connection is not formable, detection is made of the failure of the connection, and selection is made to communicate the text data as TTY-modulated data.