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This tutorial requires the use of a two-way SMS gateway.  Your project must be on the Pro or higher Software plan to test this out.  Follow the instructions in the Messaging Beginner Tutorial to choose a gateway for your project.  This gateway should allow you to do two-way messaging.  The Twillio and Tropo gateways support gateway supports most countries in the world, but you may have to pay an international messaging fee to use it.