HELSINKI (Reuters) - The world's largest handset maker Nokia launched three new phone models on Thursday, unveiling the handsets in China as it targets new clients in fast-growing emerging markets.

Finnish Nokia and its rivals like Motorola Inc. are looking for growth in markets like China, India, Russia and Brazil as most consumers in Europe and the United States already have mobile phones.

Nokia expects the world to have 3 billion mobile subscribers in 2008, compared with just more than 2 billion now.

"As around 80 percent of this growth will come from new growth markets, the importance of these markets will continue to increase," it said in a statement, adding it expects the Asia-Pacific region and China to account for 50 percent of the next billion subscribers.

All three new models, the Nokia 1112, 2310 and 2610, are expected to hit shops in the April-June quarter.

Soren Petersen, head of emerging markets operations at Nokia's Mobile Phones unit, said he expects the new 1112 model -- which is likely to retail for 45 euros ($54), excluding subsidies and taxes -- to be the top seller of the three.

"But I would expect the two others to sell in tens and tens of millions as well," he told Reuters.

The new 2610, which can receive emails, is expected to retail for 75 euros without subsidies and taxes. The 2310, which has an FM radio, would be about 65 euros.

Big volumes of cheaper phones sold in emerging markets have help to boost revenues for Nokia, which sells one in three of all mobile phones around the world.

But lower-cost phones have also reduced the average selling prices its of phones, one of the key worries for analysts following the company.

Nokia phones sold on average for 99 euros in the last quarter of 2005, compared with 111 euros a year earlier.