At least some 1 million U Mobile subscribers nationwide could be experiencing difficulties to make/receive calls, send SMS and use Internet. U Mobile is facing a network outage nationwide which started since 9PM yesterday(1 Feb).

Unfortunately, calls to U Mobile customer service hotline at 018-3881318 went unanswered. Angry customers turned to social networking site such as Twitter to express their disappointment.
At the point of writing, U Mobile customers would not notice the outage unless they try to make a call or send an SMS. Broadband, Internet and BlackBerry users would be experiencing intermittent connection.
About 1 hours and 45 minutes after the outage occurred, U Mobile posted the following message on its official Twitter account:
“Our 3G services in some areas in Kinta are currently disrupted. Some customers maybe affected. The rectification is in progress. Any inconvenience caused is much regretted. TQ. ^CS02″- Source
And about 20 minutes later it said that the outage was actually nationwide “in some areas”:
Our data services in some areas nationwide are currently having intermittent issue. Some customers maybe affected. The rectification is in progress. Any inconvenience caused is much regretted. TQ. ^CS02- Source
Last checked while this article is being written, no announcement about this outage was posted on its Facebook page despite having over 100 thousand fans. In comparison, U Mobile Twitter account has some 600 followers. [...]