DUESSELDORF (Dow Jones)--Vodafone PLC's (VOD) German unit Friday posted an increase in its first-quarter mobile service revenue for the first time in more than two years. In the quarter ended June 30, Vodafone generated in Germany, its largest market by revenue, EUR1.64 billion in mobile service revenue, an increase of 0.2% compared with the same period a year earlier. Vodafone said that the decline in voice services slowed on quarter and it benefited from growth with business customers and higher roaming revenue. Vodafone's customer base as of June 30 stood at 34.874 million, 52,000 more than a year earlier. Royal KPN's NV (KPN.AE) E-Plus will report July 27, followed by Telefonica SA's (TEF) O2 July 29. Deutsche Telekom AG's (DTE.XE) second-quarter report is due Aug 5. -By Archibald Preuschat, Dow Jones Newswires; +49 211 13872 18; archibald.preuschat@dowjones.com (END) Dow Jones Newswires July 23, 2010 06:48 ET (10:48 GMT)