For companies that pride themselves on service and reliability, AT&T and Research In Motion certainly have had their share of service interruptions, and there seems to be no end in sight.

Yet another data outage Aug. 1, although brief, is reported to have affected numerous BlackBerry users nationwide. According to Brad Mays, a spokesperson for AT&T, headquartered in San Antonio, some of AT&T’s EDGE (Enhanced Data for Global Evolution) wireless data customers around the country experienced difficulty with the wireless data network for a brief period of time. Voice calling was unaffected, and the company quickly identified the cause of the problem and fixed it.

The latest outage follows several over the past few months, including one July 20 in the Northeast, one July 2 in the Midwest and West, and a massive outage in mid-April.