This report analyses developments in the Belgium market for mobile communications in the first quarter of 2013 and compares the findings with results from the previous quarter and the same quarter last year. The report offers a full-year 2013 service revenue forecast with the main assumptions on market developments. The analysis is based on Telecompaper's continuous research into the development of the Belgian communication services market. The focus is on the mobile network operators Proximus, Mobistar and KPN Belgium/ Base, and their activities in the Belgium mobile services market