STOCKHOLM -(Dow Jones)- Mobile phone joint venture Sony Ericsson (SNE, ERIC) Tuesday introduced four new Xperia smartphones. MAIN FACTS: -Xperia S is the first smartphone in the Xperia NXT series, the next generation smartphones from Sony. -Xperia ion is the first long term evolution ("LTE") smartphone from Sony, exclusive with AT&T Inc. (T) in the US. -Xperia NX and Xperia acro HD are two smartphones for the Japanese market. -Xperia S will be available to consumers globally from 1Q 2012. -Xperia ion will be available exclusively in the U.S. from AT&T in 2Q 2012. -Xperia NX and Xperia acro HD will be available in Japan from this spring. -Sony Ericsson also unveiled a number of Android accessories that enhance the smartphone experience. -Xperia Smart Tags, small NFC enabled tokens that are used to launch pre-configured and personalised settings when you swipe an NFC Android smartphone against them. -Smart Wireless Headset pro, Bluetooth stereo headset that also works as a standalone MP3 player and radio when detached from the phone. -SmartWatch, micro display for Android to wirelessly access calls, messages and applications. -SmartDock for Xperia ion, an HDMI dock that turns Xperia ion into a mini-PC by connecting it to a USB keyboard, mouse and big screen TV. -By Dominic Chopping; Dow Jones Newswires; +46-8-5451-3093; dominic.chopping@dowjones.com