Engineers at O2 must have worked extra hours after the Telefonica-owned company hit two important targets just as the financial year came to a close.
Ofcom, the telecoms regulator, reported that O2 UK had complied with its 3G license conditions which stipulated that the operator should provide coverage for at least 80 percent of the UK population.
Ofcom had issued a warning to O2 earlier this year, threatening to fine it if it failed to meet the requirements by the end of next month.
O2 is the last of the five 3G license holders to reach this goal and failure to do so could have cost O2 around £40 million.
In related news, O2 has also announced that it has increased its fixed-line broadband range and will roll out its ADSL2+ service nationwide thanks to a deal brokered with BT's wholesale network.
O2 will also release a business broadband service which will offer speeds of up to 20mbps with unlimited usage as well as a free wireless router.