This document summarizes a presentation about mining word-of-mouth (WOM) communities in 3G mobile networks. It discusses analyzing call records to identify WOM communities through visualizations and train-of-thought analysis. Identifying influencers within communities and precision targeting of marketing allows enterprises to maximize budgets and fine-tune customer relationship management. Future research opportunities include automating the visualization process and investigating communities' subject matters through online capabilities. The conclusion is that identifying previously unknown WOM communities through mobile data analysis can provide new insights and competitive advantages for marketing.