The future of the mobile phone as a versatile, portable personal device was strengthened today, as Finnish mobile handset manufacturer Nokia made a number of important announcements.

Firstly, the company noted that it has signed an agreement with internet company Yahoo to allow Nokia smart-phone users to access Yahoo's internet services. This will include such services as e-mail, entertainment services such as ring-tones, wallpaper and downloadable games and Yahoo Search for Mobile.

Meanwhile, the company also announced the new N90, a high-end camera phone with Carl Zeiss optics. The phone has a "twist-style" design, and features two displays. Additional features also include 352 x 416 pixel main display, 2 megapixel autofocus camera with flash and video capture, 31MB memory and Bluetooth. The mobile is due to ship in Q2 of this year.

But the real news of the day from Nokia was the introduction of the new N91. This new device features a 4Gb hard drive, which Nokia says will provide enough room for up to 3000 songs. Supported formats include MP3, M4A, AAC and WMA. The phone will be able to share tunes with other users via Bluetooth.