Sony Ericsson Arc,Neo and Play unlimited unlocking. Pack 2 must be active on software
Instant unlock via Testpoints. Check out the manual here: www.x10unlocked.com
Supported models:

SE X10 Arc S – LT18i
SE Xperia Pro – MK16a
SE MT11i
SE MT15i
SE Xperia Mini Pro – SE SK17i
SE Xperia Play – SE R800
SE Xperia Arc – SE SO-01C
SE Xperia Arco – SE SO-02C
SE Xperia Ray – SE SO-03C
SE Xperia Min – SE ST15i
SE Xperia Active – SE ST17i

SE Xperia Ray – SE ST18i

Sony Ericsson Arc,Neo and Play unlock added to GPGMulti Unlocker