The Mexico Unlimited plan offers the following:

• Unlimited local and long distance calls anywhere within Mexico

For Example

Let's say you live in Costa Rica where you use your DWS VoIP account. Your mom lives in Mexico City. Instead of paying the high fees to call from Costa Rica, you can simply use your DWS VoIP phone and call as many times as you want, and speak to her unlimited as if you were living in Mexico City.