updated 6/17/2005 5:02:13 PM ET 2005-06-17T21:02:13

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.

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.

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.

Copyright 2005 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.


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