This study examines the revitalization of Indigenous languages through the integration of digital technologies and community participation, focusing on the Qowgan／Qawgan community in Hualien, Taiwan, as the primary field site. In collaboration with the Taiwan Truku Cultural Promotion Association and employing participatory action research, a Truku-language mobile community was established via the LINE social media platform to explore new modes of language practice in the digital age. The results reveal a strong sense of identity and motivation among community members regarding Truku language learning and usage. Participants express a clear preference for localized, audiovisual, and interactive digital content to enhance engagement and encourage language usage. While this mobile community demonstrates limited ability for connecting dispersed speakers and fostering new spaces for dialogue, the inclusion of offline activities is essential for deepening interaction and sustaining participation. Furthermore, raising language consciousness is fundamental to revitalization efforts, and addressing local needs while fostering grounded, community-led practices is key to ensuring long-term sustainability.