LONDON—Nokia today announced a new line of Internet-enabled feature phones for developing countries, the Asha series, which plays to the company's strength in emerging markets. The new phones come with a special data-compressing Web browser and can download Angry Birds, the company said.

"We can bring data to people who have never had it before," said Blanca Juti, Nokia's vice president of mobile phone marketing.

The four phones also have a cloud-powered browser that compresses data up to 90 percent, Juti said. That's similar to Opera Mini or to Amazon's new Silk browser for the Amazon Kindle Fire tablet.

"The line is blurring between smartphones and mobile devices. There's multiple customizable home screens, very similar to a lot of smartphones," Nokia CEO Stephen Elop said.

The Asha 303 (below) is a QWERTY-packing, touch-screen phone with a sunlight-visible screen, Juti said. It comes in multiple colors, runs on a 1-Ghz processor, and supports Wi-Fi and 3G. The phones new Series 40 interface puts Facebook and Twitter on the home screen, as well. The phone also comes with Nokia Maps and the ability to download apps, including a new version of Angry Birds designed for Nokia's Seires 40 feature phones.

"Did you know over 30 percent of the apps downloaded on Nokia's store are downloaded on Series 40?" Juti said.

The Asha 300 combines a touch screen with a traditional phone keypad, putting Facebook updates on the home screen and leaving the user "one swipe away from her favorite apps," Juti said. This one-handed, social-networking-centered phone also has a 5-megapixel camera on the back, she said.

The Asha 200 (above) plays on Nokia's recent successes with dual-SIM phones. Two-SIM phones are very popular in some countries, though they're essentially banned by U.S. operators. Nokia has been selling millions of phones with its "easy swap" feature, Elop said. The feature allows users to add and remove SIMs without rebooting the phone, and it comes in very lurid colors.

"You can't possibly be lime green and not have attitude," Juti said.

The Asha 200 and the single-SIM Asha 201 have up to 32GB of memory for music and an extremely loud speaker so they can be used as boom boxes in the street, Juti said. The two phones feature 52 hours of continuous music playback each.

The new phones also feature the instant-messaging program WhatsApp, which is also largely unknown in the U.S. but is hugely popular in the developing world.

While Nokia is struggling to sell smartphones in western Europe and the U.S. right now, developing markets have been a strong point for the company.

"We have gone from a standing start to 18 million [dual-SIM] devices in Q3," Elop said. "We believe that the best opportunity lies in high-growth emerging markets," he said.

The Nokia Asha 300 will cost 85 euros when it comes out later this year, Elop said. The 303 will cost 115 euros, and the 200 will cost 60 euros. The Asha 201 will come out in early 2012 and cost 60 euros, he said.

Also today, Nokia unveiled two new Windows Phone-based devices, the Lumia 800 and 710, which are coming to the U.S. in early 2012, possibly even to Sprint and Verizon.