a. Use the carrier endorsed Skype app
For example, when you use Verizon Skype app, you can make Skype-to-Skype calls without deducting minutes from your voice service plan. And you can make inexpensive international Skype Out calls with rates starting around 2 cents a minute.
b. Download Skype over Wi-Fi on your own
The carrier provided Skype only works on its network. But the Skype over Wi-Fi enables you to bypass the wireless phone network when making phone calls. This is especially important when you travel overseas, by using Skype over Wi-Fi, you can save hefty roaming charges.