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Any mobile device will do if that's what you're referring.
You just have to follow the steps given from this thread to enable SMS notification in your form.
If you encounter any problems, let us know here.
By the way, you might also find this article helpful. http://www.omniweb.com/wordpress/?p=176
According to him, all credo mobile uses sprint network so the following SMS email works.
Replace YOUR-MOBILE-NUMBER with your actual mobile number.
Let us know how this goes.