BlackBerry has announced yet another set of disappointing financial results as it struggles to turn around its ailing smartphone business.

The company said that it sold just 1.9 million smartphones in the last three months - almost half that of the 3.7 million sold in the previous quarter.

In all BlackBerry lost $4.4 billion, including a massive $2.6 billion loss on its BB10 devices. Most of the phones it did sell were based on the almost archaic BB7 operating system, it said.

The new interim CEO John Chen said he had implemented a new company structure to try and stem the losses, and added the company would work with Asian tech builders Foxconn on a new range of cheap phones for emerging markets.

"Foxconn's scale and efficiency will let us compete more effectively," the company said. It added that as well as new markets like Indonesia and Mexico, it would focus on reaching "prosumer" and business customers.

On the plus side, Blackberry said that the launch of its BBM messaging platform on iOS and Android had won 40 million new users.

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