Sporadic interruptions in Research In Motion’s BlackBerry service to four major U.S. carriers were reported by some customers on Wednesday, with no signs of when a fix might arrive.

U.S. BlackBerry users on Cingular, T-Mobile, Verizon, and Sprint Nextel and Canadian users on Rogers have been experiencing BlackBerry outages and problems with Blackberry Internet Service (BIS) since the beginning of the week. Other than acknowledging that their is a problem that appears to be on RIM’s side, the carriers and RIM haven’t really been all that much help.

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