The world's third largest computer vendor last month announced four new 3G touchscreen smartphones that use Microsoft's Windows Mobile OS.

The DX900 will be available by the end of this month, according to Vincent Chen, manager of product marketing at Acer's Smart Handheld Business.

The device is a 3G touchscreen smartphone that holds two SIM cards. One of the SIM card slots supports HSDPA (high speed downlink packet access), while the other supports EDGE (enhanced data rates for GSM evolution).

The Acer X960 will be out by early next month. The device has a 2.8-inch touchscreen as well as a five-way navigation button under the screen. It includes GPS functions, a 3.2-megapixel digital camera, music player and more.

The company's two premium handsets, M900 and F900, which sport 3.8-inch touchscreens, will be on world markets later in the second quarter.