When will I be billed for international calling usage?
Edited
Calls made internationally are calculated on a monthly basis, from the 1st to the last day of the month. These charges will either be added to any existing invoice or a new invoice will be created just after the 1st of each month.
To view your current international charges, login to your account and review your Call Logs. To view rates to a destination, visit simplephoneco.com/world-rates.