Since its an Android phone there are also a number of Google applications pre-installed, including Maps with Street View, Talk and Voice Search.

The Xperia X10 mini and Xperia X10 mini pro will start shipping in some markets outside the U.S. in the second quarter. Sony Ericsson also hopes to sell the phones in the U.S., but hasn't yet set a timetable.

The Xperia X10 mini will cost about €350 (US$475) before operator subsidies and the addition of a QWERTY keyboard to the pro version will add about €20, according to a Sony Ericsson spokesman.

Sony Ericsson will also launch a pro version of its Vivaz phone with a QWERTY keyboard. The company seems to have taken the criticism that it lacks smartphones with QWERTY keyboards to heart. The Symbian-based Vivaz pro will start shipping in the second quarter and cost between €450 and €500, a Sony Ericsson spokesman said.

Sony Ericsson hopes that the three new models, the Vivaz and the Xperia X10 -- which the company has dubbed the fab five -- will help turn around the company's fortunes. Sony's CEO Howard Stringer was in Barcelona to show his support for the mobile phone vendor.