My phone's from Europe, and I'm pretty sure it's two.
HOLY CRAP YOUR RIGHT!!!
But its not just European phones!
Here is what Sony has on their Sonymobile.com website:
Our warranty
Subject to the conditions of this Limited Warranty, Sony
warrants this Product to be free from defects in design,
material and workmanship at the time of its original purchase
by a consumer. This Limited Warranty will last for a period of
two (2) years as from the original date of purchase of the
Product for your mobile device, and for a period of one (1)
year following the original purchase date of the Product for all
original accessories (such as the battery, charger or handsfree
kit) which may be delivered with your device.
Looks like WE ALL have a 2 year warranty!! WOOOT!!