Frustrated that you've had to sign up to T-Mobile just to pick up an Xperia Z1 variant with completely US-native LTE? That won't be a problem after this week. Sony has released an unlocked version of the Z1 that can take advantage of 4G speeds on AT&T, T-Mobile and their virtual network partners. The flagship Android phone should also support LTE on bigger Canadian carriers, if you're inclined to travel. You won't get anything else special for the $620 you'll spend on the unlocked model, but it may scratch the itch if you're unwilling to wait for stateside releases of newer hardware like the Z2 or Z1 Compact.