India is estimated to have one million users of BlackBerry.
"We are working to resolve an issue currently impacting some BlackBerry subscribers in Europe, the Middle East and Africa and India. We're investigating, and we apologise to our customers for any inconvenience caused whilst this is resolved," Canada-based RIM said in a statement.
Telecom operators in India maintained that there was no problem at their end. Glitches in BlackBerry services were reported from different parts of the world.
"Millions of BlackBerry smartphone users have been cut off by a major fault at RIM, the Canadian company that makes the devices," UK's Daily Telegraph said in a report.
"The glitch... was affecting online services for consumers all over Europe, the Middle East and Africa. All are served by a RIM data centre in Slough," it added.
Hundreds of users flooded microblogging site Twitter, complaining about disruptions in BlackBerry services.
Published 10 October 2011, 16:03 IST