Blackberry network down for hours

Blackberry devices across the country were unable to send or receive e-mails for nearly four hours Friday, cell phone carriers Cingular Wireless and T-Mobile said.

The network disruptions started at 8:15 EDT and lasted until about noon. They were related to issues at Research in Motion Ltd., the Waterloo, Ontario-based company that makes the popular Blackberry wireless device.

A Research in Motion spokesperson could not be reached immediately.

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The service interruption affected many of Research in Motion's carrier partners, T-Mobile said.

Blackberries are also offered by other mobile carriers including Sprint Corp., Nextel Communications Inc. and Verizon Wireless.

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The popular wireless devices are particularly popular with businesses. Cingular spokesman Mark Siegel said Cingular does not release the number of Blackberry devices in use.

Cingular is a joint venture between SBC Communications Inc. and BellSouth Corp.