T-Mobile is rolling out two new, faster smartphones in a bid to win more customers from competitors this holiday season.

The new devices, the Galaxy S II from Samsung and the Amaze 4G from HTC, will be the first to tap into T-Mobile's upgraded 4G network and promise to double download speeds for customers streaming video or surfing the web.

Without an iPhone in its arsenal, Bellevue-based T-Mobile has fought to hang on to subscribers in recent months. But its new phones, which double downloads speeds to more than 8 megabits per second and are packed with other features, make for a strong and competitive line-up, said the company.

“These new products unlock the full potential of our faster 4G network and deliver the best experience yet for watching video, surfing the Web, and creating and sharing content on the go,” said T-Mobile chief marketing officer Cole Brodman in a statement.

T-Mobile isn't expecting to get an iPhone this year and the two new devices are aimed at filling that hole, reports AllThingD.

Both phones -- expected to launch in October -- are Android-based and priced above $200, said T-Mobile.

The HTC Amaze has a 4.3-inch qHD screen, an 8-megapixel camera and 1080p HD video recorder with quick while the Samsung Galaxy S II, at 4.5 inches, has the largest touchscreen in the T-Mobile line-up and is considered a "media powerhouse," allowing users access to movies, TV shows, websites and games.

Both smartphones are equipped with NFC chips, the technology that could soon allow customers to make mobile payments with their phones.

The announcement comes as T-Mobile and AT&T fight for government approval of their planned merger. A U.S. district judge has set a Feb. 13 trial date for the federal government's anti-trust case that seeks to block AT&T's planned $39 billion takeover of T-Mobile.