*International Calling Add-Ons: Good for 30 days as long as your AT&T PREPAID account balance has not expired. Your voice plan must be active at the time of purchase or renewal of Add-On. Standard per-minute rates apply if Add-On is not renewed. $10 International Add-On includes 250 minutes of calling to mobile and landline numbers in 70 countries. Minute balance rolls over if renewed before the Add-On expiration date. If your plan includes unlimited calling to Mexico and Canada, calls to those countries will not be deducted from your International Add-On minutes. $15 International Plus Add-On requires monthly or multi-month voice plan. Includes unlimited calling to mobile and landline numbers in over 85 countries and reduced per-minute rates to 140 more.