12 October 2011 Last updated at 10:29 ET
RIM UK managing director Stephen Bates:
"Engineers are working around the clock to fix the problem"
Problems with the Blackberry smartphone system appear have to spread to the United States.
Users began to report loss of services on Wednesday, with many turning to Twitter to complain about their lack of email.
The latest development follows two days of sporadic blackouts across Europe, the Middle East and Africa.
Blackberry's owner, RIM, said that the earlier problem was caused by core and back-up switch failures.
As news of the failure in the US spread, one user tweeted: "What is the status here in the USA? I am in New York and there seems to be no email service."
Another, who lives in Texas, wrote: "My #blackberry is not working! I can dial out that's it. What's up?".
'Data backlog'Blackberry had earlier declared services to be "operating normally", only to be contradicted by frustrated users.
Many called on the phone firm to "sort out" the problems and get the network running again.
RIM acknowledged that it was still experiencing problems and apologised for the inconvenience.
"The messaging and browsing delays... in Europe, the Middle East, Africa, India, Brazil, Chile and Argentina were caused by a core switch failure within RIM's infrastructure," a company statement said.
"Although the system is designed to failover to a back-up switch, the failover did not function as previously tested.
"As a result, a large backlog of data was generated and we are now working to clear that backlog and restore normal service as quickly as possible."
The blackouts have left millions of users without email, web browsing and Blackberry Messaging (BBM) services.
The cause is believed to be due to server problems at RIM's Slough data centre.
She just got one of my emails but she wasn't getting them earlier. Must be up and down. Sucks to be BlackBerry! Well I guess that has been the case since Android/iphone became viable work options.
I have a Blackberry server at work. Some users have been getting mail all day, others have been intermittent. It seems to be users in the northeast that are impacted the most. I think that Asia and Europe have been stable all day. At one point the pending count was around 1400, but last I checked it was down to about 1100 messages.
I have an iphone..never had email issues. Husband has a bb and this is the 2nd or 3rd outage for him. He is so addicted to that stupid thing, I can't help but laugh while watching him stress out on days like Wed with no email.
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