This excerpt taken from the TEO 20-F filed Jun 26, 2009.
TLRD and roaming
During year 2008, costs of TLRD and roaming increased 23.8% to P$941 million from P$760 million in year 2007. During year 2007, costs of TLRD and roaming increased 30.6% from P$582 million in year 2006. The increases were due to an increase in wireless traffic among wireless operators as a consequence of a strong growth in the total customer base and to an increase in the volume of total traffic.
Costs of TLRD and roaming accounted for approximately 13.5% of total segment net sales for 2008, 13.2% for 2007 and 13.5% for 2006, respectively.