Known TMO issue since Oct 5
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I've been having intermittent trouble getting emails or accessing the internet recently, so I called Customer Care at TMO. She found that there IS a known network issue in the Dallas/Fort Worth, Plano, and surrounding issues - reporting that users of BB and Sidekick (and some TZones devices) may not be able to access internet or email periodically.
Currently I can't even get a GPRS (in all caps) at all - I'm on hold waiting for Tier 2 support to see if there's anything we can do (trying to rule out a problem on my end).