The new model was shown along side several other new handset models at a Stockholm press conference on Monday.
The night before the company unveiled the new phones at the start of the Mobile World Congress trade show in Barcelona, Spain.
“Xperia represents the first brand that is truly borne from within Sony Ericsson. It represents our vision for a premium, energized communication experience,” said Dee Dutta, Sony Ericsson’s head of marketing.
The X 1, a multimedia handset, features a Microsoft operating system. It is also equipped with a touch screen and QWERTY-keyboard.