World's leading mobile phone firms fight back

The world's leading mobile phone makers, Nokia and Samsung, are fighting back against the popular e-mail-enabled BlackBerry smartphones and their iPhone rivals, analysts say.

With the unveiling of their own new smartphone models in Singapore this week, Finland's Nokia and South Korea's Samsung appear to have taken up the challenge, they say.

Nokia, the world's number one mobile phone maker, rolled out two new e-mail-capable devices targeted at business professionals who want easy and instant access to their messages.