UPDATE 1-Vodafone Turkey to invest 1 bln lira

* Vodafone to invest 1 billion lira ($675 million) in Turkey

* Vodafone, Turkcell, Avea launch 3G services

ISTANBUL, July 30 (Reuters) - Vodafone in Turkey plans to invest 1 billion lira ($675 million) in technology over the next 12 months as it seeks to boost its position in the fast-growing market, the unit's chief executive, Serpil Timuray, said on televison channel CNN Turk on Thursday.

The investment is expected to include high-speed third-generation (3G) mobile phone services.

Vodafone (VOD.L), Turkcell (TCELL.IS) and Avea, a unit of fixed-line operator Turk Telekom (TTKOM.IS) launched 3G phone services in Turkey on Thursday.

Analysts see the Turkish market as having strong growth potential because of the low level of broadband penetration and limited high-speed mobile data services. Mobile phone penetration remains high though at 88 percent.

The launch of 3G was delayed several times due to problems with the tender process, including the lack of sufficient bids. (Reporting by Ayla Jean Yackley; Writing by Paul de Bendern; Editing by Greg Mahlich)