Updated

Samsung, the world's largest maker of mobile phones, said its third-generation Galaxy S smartphone went on sale Tuesday in 28 European and Middle Eastern countries, hoping to cement its lead over Apple's iPhone.

The Galaxy S III smartphones hit the shelves in countries including France and Britain. By the end of July, nearly 300 mobile operators around the world will be selling the device.

Buyers of the new smartphone in five European countries will also be the first to get their hands on Samsung's music streaming service.

In Germany, France, Spain, Italy and Britain, the Galaxy S III will be shipped with access to the Music Hub -- an iTune's like service allowing users to listen to music as well as buy and store it. Samsung said the service has a 19-million song catalog.

Samsung said the initial response to the new smartphone was positive. At Vodafone Group, pre-sale orders for the Galaxy S III outstripped those of any previous Android-based smartphones, according to Samsung.

More On This...

The Galaxy series of smartphones is widely acknowledged in the industry as a success for Samsung, turning it from a smartphone also-ran into a viable competitor with the iPhone from Apple Inc.

While Apple has kept the screen size of the iPhone the same in every upgrade since 2007, Samsung increased the screen size of its highest-end smartphone in its two major updates. The latest Galaxy phone screen is nearly twice as big as the iPhone screen.

The 4.8-inch S III also features more computing power that supports voice commands and an eye-movement tracking feature to keep the screen from dimming.

The music service, which is available in free and paid versions, can recommend new tunes based on a user's listening preferences.

The paid service allows uploading and storage of music files on servers that can be accessed from more than one Internet-connected device at a cost of euro9.99 per month, Samsung said.

Unlike Apple, which uses its in-house operating system and iTunes music service, Samsung has relied on Google's Android operating system for its flagship smartphones.

Samsung's music service is a result of its acquisition of mSpot Inc., a Palo Alto, California-based provider of music and movie streaming services on the Web and mobile devices.

The Korean firm has been making efforts to increase homemade mobile content, such as its own messaging application, hoping that these features will boost consumer loyalty.

Samsung overtook Apple in smartphone sales for the first time in the first three months of this year, according to research firm Strategy Analytics. The Suwon, South Korea-based company sold 44.5 million smartphones in the January-March quarter, compared with Apple's 35.1 million iPhone sales.

Market watchers expect that Apple may use its annual conference for developers next month to announce the yearly upgrade to the iPhone, which then can go on sale as early as July.

Aside from being big rivals in the smartphone market, Samsung and Apple have also a close business relationship. Samsung supplies mobile chips and display panels for iPhones and iPad tablet computers, counting Apple among its biggest clients.