BlackBerry has suffered a network outage affecting users across the Asia Pacific and Canada.
The outage hit Canada's leading mobile network, the company notified customers yesterday. It said it had identified a potential cause and was working on a fix.
The issue did not appear to affect users of BlackBerry's new BlackBerry 10 operating system.
Users reported delays in sending or receiving messages, registering their device, and using BlackBerry Messenger or BlackBerry Browser.
Canadianoutages.com, a website that collates customer complaints about various technology services including internet and wireless communications, showed a spike in complaints about BlackBerry starting early on Tuesday morning.
The outage follows a similar, days-long BlackBerry outage in October 2011, which bruised the company's already declining reputation.
Its shares were up 1.6 percent by early afternoon in Nasdaq trade, but at just US$10.55 were far below historic peaks last seen several years ago.