[dreamcatcher]

Ever heard of the term ODM??
Its not possible for companies to have factories for each and every type of device. So to save costs the Xperia was ODM'd to HTC but the software and others were SE exclusive. As of now, SE has expelled its ODM order to HTC and moved to foxconn who ODMs the iphone.(Yea, you heard it right, the iphone isnt "made" by apple).
Most manufacturers ODM's their devices to other factories to save costs. The whole tech sector works with each other to save consumers from bearing the brunt of extra costs.