NTT DoCoMo's Wristomo I-mode wristphone sold out within 20 minutes of going on sale, the company said yesterday.

Wristomo was made available to the Japanese public on Wednesday at 10am local time. By 10.20am, all 1000 devices that made up the wristphone's first production run, had been sold.

Each phone costs ¥37,000 ($316). It operates on Japan's PHS (Personal Handyphone System) network, enabling internet access as well as voice calls. It ships with software allowing its internal phone book and diary to by synchronised with Microsoft Outlook via a separate data cable.

Each Wristomo measures 17 x 4 x 1.75cm (6.8 x 1.6 x 0.7in) and weighs 110.6g (3.9oz), said the company. Talk time is 120 minutes; standby time around 200 hours.

DoCoMo's launch is set to be followed by Samsung's GPRS wristphone in Europe in Q4, and Motorola's IDEN wristphone.

NTT DoCoMo said it plans to offer a second batch of 1000 Wristomos via its web site next Thursday at 10am. ®

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