Calling Cards are useable for long distance within the Continental US. All calls are billed to your primary account number.
To request Sover-PhoneCards just Contact Us and in most cases your new card will be ready to use within one business day.
Note that payphone use may incur a surcharge. Any discounts in place on your services are applied to PhoneCard charges as well, except for payphone (or other) surcharges, taxes, and similar fees.