British mobile phone developer Sendo has become the latest company to announce a one-piece smartphone designed to meet all of a roaming user's needs in a single device.

Due to ship during the first quarter of 2004, the Sendo X is based on the Symbian Series 60 operating system already used in phones from Nokia, Siemens and others, but with extensions. These include support for up to six email accounts and email synchronisation.

It will also do SyncML over the air, once network operators deploy SyncML servers. SyncML is a standard protocol for synchronising corporate data such as contacts, diary items, memos and email, onto PCs, handhelds or phones over any network link.

On the personal side, the phone has ‘personal’ software to play MP3s, a VGA camera, a graphics coprocessor that enables it to record and display video at 15fps, and specially designed high-volume acoustic chambers to go with its MP3 and 64-voice polyphonic sound capabilities.

The Sendo X comes with synchronisation software for a range of PC applications, including Microsoft Outlook, Lotus Notes and Lotus Organizer. It also has viewer software enabling it to display many different file formats, such as MS-Word and PDF.

Options for the smartphone include a folding keyboard. The device features Bluetooth and a slot for MMC or SD memory card, which can be used to expand its existing complement of 64MB flash memory and 16MB of working RAM.

Sendo's head of product strategy and marketing Ron Schaeffer said that Symbian was easier to work with than Microsoft's Smartphone operating system which Sendo had previously licenced, in part because it includes as standard features which the Microsoft software had lacked, such as support for MMS multimedia messaging and Java.

CEO Hugh Brogan added that Sendo's lawsuit against Microsoft, which alleges that Microsoft leaked Sendo's technical developments to another Smartphone hardware manufacturer, HTC, is still ongoing. He refused to rule out the possibility of litigation against HTC, which makes the Orange SPV.