During the last years, mobile telecommunication has been a segment with remarkable commercial success in Brazil, presenting a fast user base growth and a market penetration that exceeded the best expectations from the own operators. A significant part of this success is due to the adoption of cell phone by lower income users. Considering this context, this research aims to study the impacts of mobile telecommunication for this specific segment, by depicting the motivations for its usage, the impacts on user´s daily life and how they learned and use available services. Based on extensive interviews with lower median family income users, the research indicates that the cell phone can help improve life quality, through social integration and greater work opportunities. On the other hand, we can note an opportunity to improve cell phone usage among lower income users, by simplifying and divulgating the benefits of existing services.