Mobile communications is a booming sector nowadays, while the average revenue per user is decreasing year over year. Such tendency could create a significant risk factor for development and sustainability of mobile services in Baltics too. Development trends of the Estonian, Latvian and Lithuanian mobile markets, their demand and supply individualities, drivers, challenges and risks are analysed in the article. Predicted development scenario (till 2020) shows the growing demand for mobile services and their increasingly active usage. Operators’ challenges and several risks for supply sustainability have recognized; they have to be prevented timely by operators as well by governments and regulators.