Matthew Key, chairman and chief executive of Telefónica Europe, said O2's UK business showed 10% year-on-year growth, with net mobile additions in the year up 45.3% to 1,087,866.
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"In the fourth quarter we added 499,000 fixed and mobile customers, and ended 2008 with a total customer base approaching 22 million, including Tesco Mobile," he said. This represents growth of 7.5% year-on-year.
Telefónica O2 UK's total average revenue per user (ARPU) rose slightly to €30 in 2008.
"Data ARPU had a very strong performance in 2008, with a year-on-year increase in local currency of 9.2% to €10.3," Kay said.
This was driven mainly by an increase of 270,157 in the number of mobile broadband connections, putting the total broadband customer base at 340,866. Non-SMS data revenues increased 55.4% year-on-year in sterling in the year, he said.
Kay said Telefonica's total customer base was up 9% to 46 million. This pushed sales up 5.9% to a shade over €7bn.