­Telefónica Europe, which runs O2 in the UK, says revenue reached €7.28 billion in the first half of 2010, up 10.8% year-on-year. It now has a total of 54.5 million customers in Europe, up 6.1% year-on-year. 45.2 million of these are on its mobile networks.

Telefonica O2 UK'S customer base (excluding Tesco Mobile) increased 4.5% year-on-year to 21.6 million at the end of June. The number of 'contract' customers was up 11.7% year-on-year.

Phil Jordan has joined O2 in the new role of UK Chief Information Officer. He reports to UK Chief Technology Officer Derek McManus.

Most recently, Phil was Vodafone's CIO for the UK and Ireland, having been with the company for 12 years.

Telefónica Europe, which bought mobile VoIP company JAJAH in December, has started rolling-out JAJAH-powered IP-based phone services across its O2 businesses in Europe.

The first is international calling service O2 Global Friends, which lets customers in Germany make international calls by dialling a dedicated local number. The call is then routed over the internet without the need for any software downloads or new hardware.

O2 UK is the latest mobile network operator to remove 'unlimited' mobile data for new customers. Although existing customers won't be affected, any new or upgrading customers will have a fixed data allowance on their tariff and will need to choose a 'Bolt On' allowance if they want to exceed this. The new tariffs will be introduced from 24th June – when the iPhone 4 launches – although unlimited data will be available as a promotion until 1st October 2010.

The company says current usage patterns show that 97% of O2 customers would not need to buy additional data allowances as the lowest bundle (500MB) provides at least 2.5 times the average O2 customer's use.