I remember an instructive conversation with a guy who developed services for the mobile phone. I was suggesting some fancy service or other that involved a small app sitting on the phone. He said it wouldn't fly with users. "No downloads, no registration, keep it simple," he said. "Or it won't stick."

Maybe that's why SMS is so powerful and why, still, it's the method of choice for services on the cellphone. Emily over at textually.org has found some more, illustrating how SMS is not just about simplicity, but flexibility.

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