With no emails, instant messaging, or social networking, BlackBerry users in Europe, Africa, the Middle East and India suffered a communication's blackout on Monday.
The service disruption could not have come at worse time for Candian firm Research in Motion or RIM - the makers of the device - which faces stiff competition for corporate users as well as regular customers.
Last month, RIM had to deal with another disruption of its Messenger service in the Americas.
Critics say there is growing concern that its servers are not secure enough.
Al Jazeera's Banu Batnagar reports.
