International calling is available on all Pay-as-you-go '30 Day International' number packages. Local calling is enabled on all numbers and all package types.
Keep in mind, U.S. and Canadian numbers can already make/receive calls within North America (US/CAN) WITHOUT having to purchase/extend to a '30 Day International' package.
If you are currently on a Pay-as-you-go '30 Day International' plan, you will only see 'Phone Number Balance Using Account Balance' as a heading in your 'Number Settings' menu.
Please see How to Make a Call for more information on calling and number formatting.