Have you read the faq page for this plan?
Calling is unlimited to some countries and has a per minute charge for others. Depending on the plan you have, messaging could be unlimited.
The plan price does not have taxes included in it, those will be added to your bill, though.
Thank you for your interest in our international calling plans. Where will you be calling to? With this plan, you will get unlimited calling to some countries while others will have a per-minute rate. Text messaging is always included. Each line that will call to other countries will need to have this plan to take advantage of the lower rates. Does this information help?