Sony Ericsson Xperia S Features :
One day, on soft Xperia Mobile of the built-in NFC capability will turn the S into a travel pass and debit card. Right now, you can exchange documents with it and scan tags. So tap it on the “bedroom” tag and WI Fi, Bluetooth and the ringtones turn off, while the alarm app turns on. For some reason, tapping again in the morning doesn't have the reverse effect. Tags are user-programmable, though.