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The MICC, which stands for Mobile Internet Content Coalition, has alleged that what Sprint is about to do on April 1st is "to restrict the content that consumers can receive in text messages from businesses and nonprofits."
At the crux of this argument is the question of "commercial speech" or "protected speech" in my view. For example, should Sprint be able to charge more for "advertising" over SMS vs. a simple text message about confirming a meeting between two people?
As SMS and other forms of message delivery become more widely used as marketing vehicles we can expect to see more of these attempts to limit what's passed over the mobile networks for free vs. paid for, not by the receiver, but by the senders.