Canada is now the second country Twitter will no longer supports outbound SMS alerts (the first is UK where outbound SMS was stopped in August, 2008) citing changes to the company’s billing and costs that are doubling every month:

Unexpected changes in our billing have forced us into a difficult situation with our Canadian SMS service. We can’t afford to support this service given our current arrangement with our providers (where costs have been doubling for the past several months.)

Canadian however can still update Twitter over shortcode (21212) and the company is to seek for “realistic, scalable SMS solution for Canada (and the rest of the world),” according to its status blog.

Currently, only US and Indian users can receive SMS alerts but it’s unclear that how long they can enjoy the feature while the micro-blogging company, which has zero revenue now, is still in search for a business model.