Sony's Xperia SmartTags app now in Android Market, useless until SmartTags are launched
What is required is an NFC enabled phone, the SmartTag app now available, and the actual SmartTags which are not yet available. And the phone must be running Android 2.3.7 or higher. The tags should be available at the same time that the Sony Xperia S launches, which would be the beginning of next month in the U.K. according to the last word we have heard.
We have a couple of videos for you to look at, the first being the official teaser from Sony that shows you a day in the life of a SmartTag user. The second comes from U.K. retailer Clove which had an Nexus S for the NFC support, and a SmartTag to use for this demonstration.
source: XperiaBlog, AndroidMarket via MobileSyrup