My family is interested in buying a Verifone Vx 610 wireless credit card processing machine for our business so we can process credit cards on the go. According to the website, it lists Sprint Nextel as a compatible provider. My question is does anyone know where I can find what compatible phones will work with this? Is it only Nextel phones? If so, would any Nextel phone work? Here is the link: VeriFone Vx 610 If anyone has any personal experience please let me know your feedback. Thanks in advance.