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Finnish mobile phone manufacturer Nokia has introduced the first smartphones to run Microsoft's Windows Phone 7.5 operating system - Lumia 800 and Lumia 710.

The phones are aimed at shaking up the mobile phone market, dominated by Apple's iPhone and rivals based on Google's Android software.

The company also unveiled four cheaper phones for emerging markets.

Here is some of the media reaction to the products - and to Nokia's new strategy.

"Don't expect the unexpected here. Nokia's two new Windows Phones are elegant, to be sure, but they're not huge departures from Microsoft's universally mandated Windows Phone experience."

"The Nokia 800 and 710 are a start. They're a good start. I'm having trouble being excited about them because Nokia CEO Stephen Elop said no Nokia Windows Phones are coming to the U.S. until next year, and Nokia U.S. president Chris Weber hinted that our phones may not be these ones.

"But if our phones have the design elegance and standout look of the Nokia 800, the company really has a chance. HTC has trumped Nokia's play for an elegant, low-cost white Windows Phone with the Radar, whose metal body feels classier than the 710."

"...the Nokia partnership and the newly refreshed Windows Phone 7.5 / Mango Operating System is the biggest and best opportunity I've seen to date.

"It simply must succeed. You can almost smell the urgency.

"The advertising campaign is costing millions and the handsets, if we're honest, are slightly tweaked versions of existing models. I think we'll have to wait just a little while longer to see face-pointing cameras and a larger range of handsets."

"We know by now what Windows Phone Mango looks like, and we've been impressed by its simple, modern good looks and truly original tile-based UI. But until now, there really hasn't been a handset to get people excited. And so, the hot-looking Lumia 800 might actually be "the first real Windows Phone."

"The Lumia 800 has the potential to be huge, a throwback to the times of the Nokia 3210 and 3310. And it should certainly please the mass market more than Android handsets, with their inconsistent and ugly UIs, their terrible battery life and their laggy touch response. Good luck, Nokia!"

"Despite the theoretical gloss provided by leadership parachuted in from Microsoft, there is still something a little rough about Nokia's presentations - as if, spiritually, they are still talking about Qt development with a group of Finnish engineers."

"Nokia and Windows Phone are at a crossroads - either two drowners clinging to each other or a promising upstart meeting a former champion looking for direction, depending on your attitude."

"Casting a shadow over all 3,000 attendees in the hall was the iPhone and to a lesser extent Android. No one mentioned them by name but they were always there.

"Has Mr. Elop done enough to halt their growth? I would like to say a definitive 'yes' that we were wowed by what we saw, that it was mind-blowing. But it wasn't.

"It was well engineered, there were some clever additions, but it lacked the 'wow' factor.

"If Tim Cook and Sergey Brin, CEOs of Apple and Google, were watching live today, they can go back to their beds untroubled."