If one is already subscribed to Vonage World, it can easily be extended to any cell phone (regular and smart phones) without subscribing to Vonage Mobile or Vonage World Mobile, thus saving $14.99 each month. Cellular minutes are not used if oneâ€™s cell phone carrier is AT&T, Verizon, T-Mobile (free unlimited calls to and from favorite numbers) or Sprint/Nextel (free incoming calls). Just install a Call Bridge/Call Back switch on the Vonage World line and place unlimited air time and long distance calls to 60 countries and even share with family, friends, associates, etc. Also the use of the Vonage World line is not restricted to USA residents only. Land lines and some cell phones in the 60 countries can also place the same unlimited calls, without a broadband connection.