Deutsche Telekom's Q1 2013 results show a 4.5% revenue decline to €13.8 billion, with solid growth in mobile customers and a 31% increase in adjusted net income. Challenges such as regulatory pressures and competition impacted financial performance, but a positive trend in underlying mobile service revenue is expected for the year. The company affirmed its full-year outlook, anticipating continued growth in key areas and maintaining shareholder remuneration policies.