Activate an Unlimited subscription plan.Sync your contacts with the app (give the app permissions in your smartphone settings area, if needed).Choose your preferred type of connection – over land lines, mobile data or Wi-Fi.Download the Rebtel app from Google Play or the App Store.
All you have to do is sign up, install the app and activate your subscription. If you often make calls to the United States from other countries, you can try a free service, like the one offered by the Rebtel International calling app.
If you want to call the US, you have to keep track of the US country and area codes of each of these states and territories. The United States of America is made up of 50 states and other territories.