As great as Twitter is, there are some limitations on SMS texting in countries other than the U.S., Canada and India. Biz Stone, one of the co-founders of Twitter, explained why this is and how to get around this limitation in an article on his blog. I have re-posted most of his explanation below. I’d also recommend reading a helpful article by MG Siegler at VentureBeat.com about the subject.

Why Stop Sending SMS To Some Countries?

Mobile operators in most of the world charge users to send updates. When you send one message to Twitter and we send it to ten followers, you aren’t charged ten times—that’s because we’ve been footing the bill. When we launched our free SMS service to the world, we set the clock ticking. As the service grew in popularity, so too would the price.

Our challenge during this window of time was to establish relationships with mobile operators around the world such that our SMS services could become sustainable from a cost perspective. We achieved this goal in Canada, India, and the United States. We can provide full incoming and outgoing SMS service without passing along operator fees in these countries.

We took a risk hoping to bring more nations onboard and more mobile operators around to our way of thinking but we’ve arrived at a point where the responsible thing to do is slow our costs and take a different approach. If you don’t live in Canada, India, or the US, then we recommend receiving your Twitter updates via one of the following methods.

• m.twitter.com works on browser-enabled phones
• m.slandr.net works on browser-enabled phones
• TwitterMail works on email-enabled phones
• Cellity works on java-enabled phones
• TwitterBerry works on BlackBerry brand phones
• Twitterific works on iPhones

Twitter SMS by The Numbers

It pains us to take this measure. However, we need to avoid placing undue burden on our company and our service. Even with a limit of 250 messages received per week, it could cost Twitter about $1,000 per user, per year to send SMS outside of Canada, India, or the US. It makes more sense for us to establish fair billing arrangements with mobile operators than it does to pass these high fees on to our users.

Twitter will continue to negotiate with mobile operators in Europe, Asia, China, Australia, The Americas, and other regions to forge relationships that benefit all our users. Our goal is to provide full, two-way service with Twitter via SMS to every nation in a way that is sustainable from a cost perspective. Talks with mobile companies around the world continue. In the meantime, more local numbers for updating via SMS are on the way. We’ll keep you posted.