Google Labs SMS Channels gives a free service to send SMS to a network, it may be a friends group or group of a people subscribed to a channel. I found that it uses some logic to shorten the contents of message to keep it within 150 characters (When it gets contents from a feed, then there are chances of length of more than one characters). To give you as much content as possible, they replace the content with short codes. As for example, to is replaced by 2, your is replaced by ur, for is replaced by 4, etc.
One interested replacement I found with it is, it once removed slashes (/) from a URL in the message. The url http://is.gd/4P47 was http:is.gd4P47 in the SMS.
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