Well, this is going to make getting a hold of an agent this much tougher around Hollywood: BlackBerry maker Research In Motion has been posting updates on its U.S. site since Monday, when service outages were reported in Europe, India, Africa, the Middle East and throughout Latin America — but not here in the States. Well, that’s changed as of today, when the “core switch failure within RIM’s infrastructure” has begun affecting U.S. customers, who are experiencing messaging and browsing delays owing to a massive backup in data. From RIM this morning in its latest update:

BlackBerry subscribers in the Americas may be experiencing intermittent service delays this morning. We are working to resolve the situation as quickly as possible and we apologize to our customers for any inconvenience. We will provide a further update as soon as more information is available.

It’s certainly impacting Deadline’s writers, who are having trouble receiving emails — and they gets lots of emails. They are just a few of BlackBerry’s more than 70 million customers worldwide. The company has been losing market share in the U.S. due to the growing popularity of rivals such as Apple’s iPhone, but has been adding subs internationally; RIM’s U.S. revenue fell 50% last quarter to $1.11 billion, while sales outside the U.S., U.K. and Canada grew 38% to $2.33 billion. RIM shares have lost about 45% of their value over the last 12 months and in late afternoon trading are down more than 2% today.