Some BlackBerry users are complaining of an inability to use data services for the second day in a row.
It appears that the issue could be related to two separate problems. While some users seemed to be back in business late Tuesday, others were still having problems.
Research In Motion does not appear to have commented on the problem and had not replied to a request for comment by the time this story posted.
Via Twitter, T-Mobile has acknowledged that there is an issue. "We are working with Research In Motion to resolve the outage as quickly as possible," it said in a recent Twitter message.
That was in response to Teresa Boardman, a BlackBerry user in St. Paul, Minnesota, who at about 3 p.m. Central Time said that it had been more than 24 hours since her BlackBerry data services had worked.
But earlier in the day, after asking subscribers for patience while the issue was being resolved, T-Mobile suggested that users restart their phones and thanked others for mentioning that their services were back up and running.
Martin Kastenbaum, a BlackBerry user in Houston, Texas, reported via Twitter that his data service was down for a few hours but earlier today was restored.
One of the problems seems to be affecting some users of BlackBerry phones that have Wi-Fi capability, although the problem does not affect those users when they are connected to Wi-Fi networks. Instead, those users have trouble using data services when they are on mobile networks. That's according to a user report on the Data Outages forum.
Some BlackBerry users on Verizon's network are also complaining on Twitter of a lack of e-mail service today. Neither T-Mobile nor Verizon immediately responded to requests for more information about the problems.