Earnings before interest, tax, depreciation and amortisation (EBITDA) in the final three months of 2010 fell 10.7 percent to 130.5 million euros ($178 million), which compared with an average forecast of 130 million euros given in a Reuters poll of 12 analysts.

Mobistar's core mobile phones business was already hit last year by regulatory caps on roaming rates and mobile termination rates, the amount operators can charge rivals for routing mobile phone calls.

Mobistar, which is majority-owned by France Telecom , is forecasting a core profit in 2011 of between 505 and 535 million euros and net profit of 210 and 230 million euros, below the 548.7 million euros in EBITDA and 263.6 million euros in net profit made in 2010.